diff --git a/config/rel_slices.yml b/config/rel_slices.yml
index fe2d4c6c..2f491205 100644
--- a/config/rel_slices.yml
+++ b/config/rel_slices.yml
@@ -71,6 +71,10 @@ m_police_box.c:
     .text: [0x803DE8A0, 0x803DEE38]
     .rodata: [0x806431C8, 0x806431D8]
     .data: [0x8065BE98, 0x8065BEF0]
+m_random_field.c:
+    .text: [0x803E4B20, 0x803E50E4]
+    .rodata: [0x80643218, 0x80643240]
+    .data: [0x8065C098, 0x8065C588]
 m_room_type/mRmTp_FtrItemNo2FtrIdx.c:
     .text: [0x803E7878, 0x803E78BC]
 #m_time.c: # unlinked until function callers that reorder local static variables are implemented.
diff --git a/include/m_collision_bg.h b/include/m_collision_bg.h
index c72ed981..f161d66e 100644
--- a/include/m_collision_bg.h
+++ b/include/m_collision_bg.h
@@ -58,6 +58,7 @@ extern f32 mCoBG_GetBgY_AngleS_FromWpos(s_xyz* angle_to_ground, xyz_t wpos, f32
 extern int mCoBG_CheckWaterAttribute_OutOfSea(u32 attribute);
 extern int mCoBG_CheckHole_OrgAttr(u32 attribute);
 extern f32 mCoBG_GetBgY_OnlyCenter_FromWpos2(xyz_t wpos, f32 foot_dist);
+extern int mCoBG_Attribute2CheckPlant(u32 attribute, const xyz_t* wpos);
 
 extern f32 mCoBG_GetWaterHeight_File(xyz_t wpos, char* file, int line);
 #define mCoBG_GetWaterHeight(wpos) mCoBG_GetWaterHeight_File(wpos, __FILE__, __LINE__)
diff --git a/include/m_field_info.h b/include/m_field_info.h
index 0fc37efb..44c03624 100644
--- a/include/m_field_info.h
+++ b/include/m_field_info.h
@@ -21,6 +21,8 @@ extern "C" {
 #define mFI_ROW_TO_CHARSTR(row) ((row) + 'A')
 #define mFI_COL_TO_CHARSTR(col) ((col) + '0')
 
+#define mFI_NUM_SOUND_SOURCES 6
+
 enum field_type {
   mFI_FIELDTYPE_FG,
   mFI_FIELDTYPE_1,
@@ -100,6 +102,15 @@ typedef struct block_table_s {
   mActor_name_t* items;
 } mFI_block_tbl_c;
 
+enum {
+  mFI_SOUND_SOURCE_POND = 3, // TODO: might not be correct name
+};
+
+typedef struct sound_source_info_s {
+  s16 kind;
+  xyz_t wpos;
+} mFI_sound_source_info_c;
+
 extern int mFI_CheckFieldData();
 extern mActor_name_t mFI_GetFieldId();
 extern int mFI_GetClimate();
@@ -120,6 +131,12 @@ extern mCoBG_Collision_u* mFI_GetBkNum2ColTop(int block_x, int block_z);
 extern u32 mFI_BkNum2BlockKind(int block_x, int block_z);
 extern int mFI_BlockKind2BkNum(int* block_x, int* block_z, u32 block_kind);
 extern int mFI_GetBlockUtNum2FG(mActor_name_t* fg_item, int block_x, int block_z, int ut_x, int ut_z);
+extern void mFI_UtNum2CenterWpos(xyz_t* wpos, int ut_x, int ut_z);
+extern u8 mFI_GetBlockXMax();
+extern u8 mFI_GetBlockZMax();
+extern u8 mFI_BkNum2BlockType();
+extern mFI_sound_source_info_c* mFI_GetSoundSourcePBlockNum(int block_x,int block_z);
+extern int mFI_Wpos2UtNum(int* ut_x, int* ut_z, xyz_t wpos);
 
 extern void mFI_PrintNowBGNum(gfxprint_t* gfxprint);
 extern void mFI_PrintFgAttr(gfxprint_t* gfxprint);
diff --git a/include/m_field_make.h b/include/m_field_make.h
index 9e745f9d..414e3b03 100644
--- a/include/m_field_make.h
+++ b/include/m_field_make.h
@@ -37,6 +37,13 @@ typedef struct fg_items_s {
   /* 0x000 */ mActor_name_t items[UT_Z_NUM][UT_X_NUM];
 } mFM_fg_c;
 
+/* sizeof (mFM_combo_info_c) == 6 */
+typedef struct block_combo_s {
+  /* 0x00 */ mActor_name_t bg_id;
+  /* 0x02 */ mActor_name_t fg_id;
+  /* 0x05 */ u8 type;
+} mFM_combo_info_c;
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/include/m_random_field.h b/include/m_random_field.h
new file mode 100644
index 00000000..6ac1fd66
--- /dev/null
+++ b/include/m_random_field.h
@@ -0,0 +1,77 @@
+#ifndef M_RANDOM_FIELD_H
+#define M_RANDOM_FIELD_H
+
+#include "types.h"
+#include "m_random_field_h.h"
+#include "m_field_make.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define mRF_BLOCK_TYPE_MAX 108 // TODO: this is likely a giant enum lol
+#define mRF_DIRECT_ERROR 100
+
+enum {
+  mRF_GATE_NONE,
+  mRF_GATE1_TYPE0,
+  mRF_GATE1_TYPE1,
+  mRF_GATE2_TYPE0,
+  mRF_GATE2_TYPE1,
+  mRF_GATE3_TYPE0,
+
+  mRF_GATE_TYPE_NUM
+};
+
+enum {
+  mRF_DIRECT_NORTH,
+  mRF_DIRECT_WEST,
+  mRF_DIRECT_SOUTH,
+  mRF_DIRECT_EAST,
+
+  mRF_DIRECT_NUM
+};
+
+enum {
+  mRF_RIVER0,
+  mRF_RIVER1,
+  mRF_RIVER2,
+  mRF_RIVER3,
+  mRF_RIVER4,
+  mRF_RIVER5,
+  mRF_RIVER6,
+
+  mRF_RIVER_NUM
+};
+
+enum {
+  mRF_FIELD_STEP1,  /* first level */
+  mRF_FIELD_STEP2,  /* second level*/
+  mRF_FIELD_STEP3,  /* third level */
+  mRF_FIELD_STEP4,  /* fourth level */
+
+  mRF_FIELD_STEP_NUM
+};
+
+typedef struct gate_s {
+  int ut0;
+  int ut1;
+} mRF_gate_c;
+
+extern u32 mRF_Type2BlockInfo(u8 type);
+extern int mRF_SearchPond(int* ut_x, int* ut_z, int block_x, int block_z);
+extern mRF_gate_c* mRF_BlockTypeDirect2GateData(int* gate_count, u8 block_type, int direct);
+extern void mRF_CheckBeastRoad();
+extern int mRF_RiverIdx2NextDirect(int river_idx);
+extern int mRF_BlockType2RiverNextDirect(u8 type);
+extern void mRF_IslandBgData_To_VillageData();
+extern int mRF_CheckFieldStep3();
+
+extern mFM_combo_info_c data_combi_table[];
+extern int data_combi_table_number;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/include/m_random_field_h.h b/include/m_random_field_h.h
index 43998a50..c10f8802 100644
--- a/include/m_random_field_h.h
+++ b/include/m_random_field_h.h
@@ -1,5 +1,5 @@
-#ifndef M_RANDOM_FIELD_H
-#define M_RANDOM_FIELD_H
+#ifndef M_RANDOM_FIELD_H_H
+#define M_RANDOM_FIELD_H_H
 
 #include "types.h"
 
@@ -31,13 +31,13 @@ extern "C" {
 #define mRF_BLOCKKIND_OCEAN (1 << 20)
 #define mRF_BLOCKKIND_ISLAND (1 << 21)
 #define mRF_BLOCKKIND_OFFING (1 << 22)
-#define mRF_BLOCKKIND_23 (1 << 23)
-#define mRF_BLOCKKIND_24 (1 << 24)
-#define mRF_BLOCKKIND_25 (1 << 25)
-#define mRF_BLOCKKIND_26 (1 << 26)
-#define mRF_BLOCKKIND_27 (1 << 27)
-#define mRF_BLOCKKIND_28 (1 << 28)
-#define mRF_BLOCKKIND_29 (1 << 29)
+#define mRF_BLOCKKIND_RIVER0 (1 << 23)
+#define mRF_BLOCKKIND_RIVER1 (1 << 24)
+#define mRF_BLOCKKIND_RIVER2 (1 << 25)
+#define mRF_BLOCKKIND_RIVER3 (1 << 26)
+#define mRF_BLOCKKIND_RIVER4 (1 << 27)
+#define mRF_BLOCKKIND_RIVER5 (1 << 28)
+#define mRF_BLOCKKIND_RIVER6 (1 << 29)
 #define mRF_BLOCKKIND_DOCK (1 << 30)
 #define mRF_BLOCKKIND_ISLAND_LEFT (1 << 31)
 
diff --git a/include/m_random_field_ovl.h b/include/m_random_field_ovl.h
new file mode 100644
index 00000000..bedf03cb
--- /dev/null
+++ b/include/m_random_field_ovl.h
@@ -0,0 +1,19 @@
+#ifndef M_RANDOM_FIELD_OVL_H
+#define M_RANDOM_FIELD_OVL_H
+
+#include "types.h"
+#include "m_random_field_h.h"
+#include "m_field_make.h"
+#include "game_h.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern void mRF_MakeRandomField_ovl(mFM_combination_c* combi_table, mFM_combo_info_c* combo_info, int combo_count, GAME* game);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/rel/m_random_field.c b/rel/m_random_field.c
new file mode 100644
index 00000000..bc08dd4b
--- /dev/null
+++ b/rel/m_random_field.c
@@ -0,0 +1,1028 @@
+#include "m_random_field.h"
+
+#include "m_random_field_ovl.h"
+#include "m_collision_bg.h"
+#include "m_field_info.h"
+#include "m_common_data.h"
+#include "m_scene.h"
+
+extern void mRF_MakeRandomField(mFM_combination_c* combi_table, mFM_combo_info_c* combo_info, int combo_count, GAME* game) {
+  mRF_MakeRandomField_ovl(combi_table, combo_info, combo_count, game);
+}
+
+static u32 mRF_block_info[mRF_BLOCK_TYPE_MAX] = {
+  mRF_BLOCKKIND_BORDER,
+  mRF_BLOCKKIND_BORDER | mRF_BLOCKKIND_RIVER0,
+  mRF_BLOCKKIND_BORDER,
+  mRF_BLOCKKIND_BORDER,
+  mRF_BLOCKKIND_BORDER,
+  mRF_BLOCKKIND_BORDER,
+  mRF_BLOCKKIND_BORDER,
+  mRF_BLOCKKIND_BORDER,
+  mRF_BLOCKKIND_BORDER,
+  mRF_BLOCKKIND_RAILROAD | mRF_BLOCKKIND_TUNNEL,
+  mRF_BLOCKKIND_RAILROAD | mRF_BLOCKKIND_TUNNEL,
+  mRF_BLOCKKIND_STATION | mRF_BLOCKKIND_RAILROAD,
+  mRF_BLOCKKIND_RAILROAD | mRF_BLOCKKIND_DUMP,
+  mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_RAILROAD | mRF_BLOCKKIND_18 | mRF_BLOCKKIND_RIVER0,
+  mRF_BLOCKKIND_PLAYER,
+  mRF_BLOCKKIND_CLIFF,
+  mRF_BLOCKKIND_CLIFF,
+  mRF_BLOCKKIND_CLIFF,
+  mRF_BLOCKKIND_CLIFF,
+  mRF_BLOCKKIND_CLIFF,
+  mRF_BLOCKKIND_CLIFF,
+  mRF_BLOCKKIND_CLIFF,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_WATERFALL | mRF_BLOCKKIND_RIVER0,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_WATERFALL | mRF_BLOCKKIND_RIVER0,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_18 | mRF_BLOCKKIND_RIVER0,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_18 | mRF_BLOCKKIND_RIVER0,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_WATERFALL | mRF_BLOCKKIND_RIVER0,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_18 | mRF_BLOCKKIND_RIVER0,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_18 | mRF_BLOCKKIND_RIVER0,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_18 | mRF_BLOCKKIND_RIVER1,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_WATERFALL | mRF_BLOCKKIND_RIVER1,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_WATERFALL | mRF_BLOCKKIND_RIVER1,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_18 | mRF_BLOCKKIND_RIVER1,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_18 | mRF_BLOCKKIND_RIVER1,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_RIVER2,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_RIVER2,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_RIVER2,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_WATERFALL | mRF_BLOCKKIND_RIVER2,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_WATERFALL | mRF_BLOCKKIND_RIVER2,
+  mRF_BLOCKKIND_NONE,
+  mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_18 | mRF_BLOCKKIND_RIVER0,
+  mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_18 | mRF_BLOCKKIND_RIVER1,
+  mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_18 | mRF_BLOCKKIND_RIVER2,
+  mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_18 | mRF_BLOCKKIND_RIVER3,
+  mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_18 | mRF_BLOCKKIND_RIVER4,
+  mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_18 | mRF_BLOCKKIND_RIVER5,
+  mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_18 | mRF_BLOCKKIND_RIVER6,
+  mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_BRIDGE | mRF_BLOCKKIND_RIVER0,
+  mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_BRIDGE | mRF_BLOCKKIND_RIVER1,
+  mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_BRIDGE | mRF_BLOCKKIND_RIVER2,
+  mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_BRIDGE | mRF_BLOCKKIND_RIVER3,
+  mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_BRIDGE | mRF_BLOCKKIND_RIVER4,
+  mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_BRIDGE | mRF_BLOCKKIND_RIVER5,
+  mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_BRIDGE | mRF_BLOCKKIND_RIVER6,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_SLOPE,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_SLOPE,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_SLOPE,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_SLOPE,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_SLOPE,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_SLOPE,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_SLOPE,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_BORDER,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_BORDER,
+  mRF_BLOCKKIND_MARINE,
+  mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_MARINE | mRF_BLOCKKIND_18 | mRF_BLOCKKIND_RIVER0,
+  mRF_BLOCKKIND_SHOP | mRF_BLOCKKIND_RAILROAD,
+  mRF_BLOCKKIND_SHRINE,
+  mRF_BLOCKKIND_POSTOFFICE | mRF_BLOCKKIND_RAILROAD,
+  mRF_BLOCKKIND_POLICE,
+  mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_POOL | mRF_BLOCKKIND_RIVER0,
+  mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_POOL | mRF_BLOCKKIND_RIVER1,
+  mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_POOL | mRF_BLOCKKIND_RIVER2,
+  mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_POOL | mRF_BLOCKKIND_RIVER3,
+  mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_POOL | mRF_BLOCKKIND_RIVER4,
+  mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_POOL | mRF_BLOCKKIND_RIVER5,
+  mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_POOL | mRF_BLOCKKIND_RIVER6,
+  mRF_BLOCKKIND_BORDER,
+  mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_BORDER | mRF_BLOCKKIND_RIVER0,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_BORDER,
+  mRF_BLOCKKIND_RAILROAD | mRF_BLOCKKIND_BORDER,
+  mRF_BLOCKKIND_MARINE | mRF_BLOCKKIND_BORDER,
+  mRF_BLOCKKIND_MARINE | mRF_BLOCKKIND_BORDER,
+  mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_BRIDGE | mRF_BLOCKKIND_MARINE | mRF_BLOCKKIND_RIVER0,
+  mRF_BLOCKKIND_NONE,
+  mRF_BLOCKKIND_MUSEUM,
+  mRF_BLOCKKIND_MARINE | mRF_BLOCKKIND_TAILORS,
+  mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_BRIDGE | mRF_BLOCKKIND_RAILROAD | mRF_BLOCKKIND_RIVER0,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_BRIDGE | mRF_BLOCKKIND_RIVER1,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_BRIDGE | mRF_BLOCKKIND_RIVER0,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_BRIDGE | mRF_BLOCKKIND_RIVER0,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_BRIDGE | mRF_BLOCKKIND_RIVER1,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_BRIDGE | mRF_BLOCKKIND_RIVER1,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_BRIDGE | mRF_BLOCKKIND_RIVER0,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_BRIDGE | mRF_BLOCKKIND_RIVER0,
+  mRF_BLOCKKIND_MARINE | mRF_BLOCKKIND_OCEAN | mRF_BLOCKKIND_OFFING,
+  mRF_BLOCKKIND_MARINE | mRF_BLOCKKIND_OCEAN | mRF_BLOCKKIND_OFFING,
+  mRF_BLOCKKIND_MARINE | mRF_BLOCKKIND_OCEAN | mRF_BLOCKKIND_OFFING,
+  mRF_BLOCKKIND_MARINE | mRF_BLOCKKIND_OCEAN | mRF_BLOCKKIND_OFFING,
+  mRF_BLOCKKIND_MARINE | mRF_BLOCKKIND_OCEAN | mRF_BLOCKKIND_ISLAND | mRF_BLOCKKIND_ISLAND_LEFT,
+  mRF_BLOCKKIND_MARINE | mRF_BLOCKKIND_OCEAN | mRF_BLOCKKIND_ISLAND,
+  mRF_BLOCKKIND_MARINE | mRF_BLOCKKIND_DOCK,
+  mRF_BLOCKKIND_MARINE | mRF_BLOCKKIND_OCEAN | mRF_BLOCKKIND_OFFING,
+  mRF_BLOCKKIND_MARINE | mRF_BLOCKKIND_OCEAN | mRF_BLOCKKIND_OFFING,
+  mRF_BLOCKKIND_MARINE | mRF_BLOCKKIND_OCEAN | mRF_BLOCKKIND_OFFING,
+  mRF_BLOCKKIND_MARINE | mRF_BLOCKKIND_OCEAN | mRF_BLOCKKIND_OFFING,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_BRIDGE | mRF_BLOCKKIND_RIVER1,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_BRIDGE | mRF_BLOCKKIND_RIVER1,
+  mRF_BLOCKKIND_CLIFF | mRF_BLOCKKIND_RIVER | mRF_BLOCKKIND_BRIDGE | mRF_BLOCKKIND_RIVER1
+};
+
+extern u32 mRF_Type2BlockInfo(u8 type) {
+  if (type < mRF_BLOCK_TYPE_MAX) {
+    return mRF_block_info[type];
+  }
+
+  return mRF_BLOCKKIND_NONE;
+}
+
+static int mRF_GateType2GateCount(int gate_type) {
+  static u8 gate_count_table[mRF_GATE_TYPE_NUM] = {
+    0, 1, 1, 2, 2, 3
+  };
+
+  if (gate_type < mRF_GATE_TYPE_NUM) {
+    return gate_count_table[gate_type];
+  }
+
+  return 0;
+}
+
+extern int mRF_SearchPond(int* ut_x, int* ut_z, int block_x, int block_z) {
+  mFI_sound_source_info_c* s_source_info = mFI_GetSoundSourcePBlockNum(block_x, block_z);
+
+  if (s_source_info != NULL) {
+    int i;
+
+    for (i = 0; i < mFI_NUM_SOUND_SOURCES; i++, s_source_info++) {
+      if (s_source_info->kind == mFI_SOUND_SOURCE_POND) {
+        if (mFI_Wpos2UtNum(ut_x, ut_z, s_source_info->wpos)) {
+          return TRUE;
+        }
+      }
+    }
+  }
+
+  return FALSE;
+}
+
+static int mRF_Attr2BeastRoadAttr(int attr) {
+  switch (attr) {
+    case mCoBG_ATTRIBUTE_GRASS0:
+    case mCoBG_ATTRIBUTE_GRASS1:
+      return mCoBG_ATTRIBUTE_GRASS2;
+    
+    case mCoBG_ATTRIBUTE_SOIL0:
+    case mCoBG_ATTRIBUTE_SOIL1:
+      return mCoBG_ATTRIBUTE_SOIL2;
+
+    default:
+      return attr;
+  }
+}
+
+#define GATE_UT(z, x) ((((z) & 0xF) << 4) | ((x) & 0xF))
+#define GATE(z0, x0, z1, x1) { GATE_UT(z0, x0), GATE_UT(z1, x1) }
+
+static mRF_gate_c gate1_type0_up[1] = { GATE(0, 7, 1, 7) };
+static mRF_gate_c gate1_type0_lt[1] = { GATE(7, 0, 7, 1) };
+static mRF_gate_c gate1_type0_dn[1] = { GATE(15, 7, 14, 7) };
+static mRF_gate_c gate1_type0_rt[1] = { GATE(7, 15, 7, 14) };
+
+static mRF_gate_c gate1_type1_up[1] = { GATE(0, 7, 1, 7) };
+static mRF_gate_c gate1_type1_lt[1] = { GATE(9, 0, 9, 1) };
+static mRF_gate_c gate1_type1_dn[1] = { GATE(15, 7, 14, 7) };
+static mRF_gate_c gate1_type1_rt[1] = { GATE(9, 15, 9, 14) };
+
+static mRF_gate_c gate2_type0_up[2] = { GATE(0, 5, 1, 5), GATE(0, 12, 1, 12) };
+static mRF_gate_c gate2_type0_lt[2] = { GATE(5, 0, 5, 1), GATE(12, 0, 12, 1) };
+static mRF_gate_c gate2_type0_dn[2] = { GATE(15, 5, 14, 5), GATE(15, 12, 14, 12) };
+static mRF_gate_c gate2_type0_rt[2] = { GATE(5, 15, 5, 14), GATE(12, 15, 12, 14) };
+
+static mRF_gate_c gate2_type1_up[2] = { GATE(0, 2, 1, 2), GATE(0, 11, 1, 11) };
+static mRF_gate_c gate2_type1_lt[2] = { GATE(2, 0, 2, 1), GATE(11, 0, 11, 1) };
+static mRF_gate_c gate2_type1_dn[2] = { GATE(15, 2, 14, 2), GATE(15, 11, 14, 11) };
+static mRF_gate_c gate2_type1_rt[2] = { GATE(2, 15, 2, 14), GATE(11, 15, 11, 14) };
+
+static mRF_gate_c gate3_type0_up[3] = { GATE(0, 2, 1, 2), GATE(0, 8, 1, 8), GATE(0, 12, 1, 12) };
+static mRF_gate_c gate3_type0_lt[3] = { GATE(2, 0, 2, 1), GATE(8, 0, 8, 1), GATE(12, 0, 12, 1) };
+static mRF_gate_c gate3_type0_dn[3] = { GATE(15, 2, 14, 2), GATE(15, 8, 14, 8), GATE(15, 12, 14, 12) };
+static mRF_gate_c gate3_type0_rt[3] = { GATE(2, 15, 2, 14), GATE(8, 15, 8, 14), GATE(12, 15, 12, 14) };
+
+static mRF_gate_c* mRF_gate_correct_info[mRF_GATE_TYPE_NUM][mRF_DIRECT_NUM] = {
+  { NULL, NULL, NULL, NULL },
+  { gate1_type0_up, gate1_type0_lt, gate1_type0_dn, gate1_type0_rt },
+  { gate1_type1_up, gate1_type1_lt, gate1_type1_dn, gate1_type1_rt },
+  { gate2_type0_up, gate2_type0_lt, gate2_type0_dn, gate2_type0_rt },
+  { gate2_type1_up, gate2_type1_lt, gate2_type1_dn, gate2_type1_rt },
+  { gate3_type0_up, gate3_type0_lt, gate3_type0_dn, gate3_type0_rt },
+};
+
+static u8 mRF_gate_info2[mRF_BLOCK_TYPE_MAX][mRF_DIRECT_NUM] = {
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE1_TYPE1, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE1_TYPE1  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE1_TYPE1, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE1_TYPE1  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE1_TYPE1, // west
+    mRF_GATE2_TYPE1, // south
+    mRF_GATE1_TYPE1  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE2_TYPE0, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE2_TYPE0  // east
+  },
+  {
+    mRF_GATE2_TYPE0, // north
+    mRF_GATE2_TYPE0, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE2_TYPE0, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE2_TYPE0, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE2_TYPE0, // south
+    mRF_GATE2_TYPE0  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE2_TYPE0, // west
+    mRF_GATE2_TYPE0, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE2_TYPE0, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE2_TYPE0, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE2_TYPE0, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE2_TYPE0  // east
+  },
+  {
+    mRF_GATE2_TYPE1, // north
+    mRF_GATE2_TYPE0, // west
+    mRF_GATE2_TYPE1, // south
+    mRF_GATE2_TYPE0  // east
+  },
+  {
+    mRF_GATE3_TYPE0, // north
+    mRF_GATE2_TYPE0, // west
+    mRF_GATE2_TYPE1, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE3_TYPE0, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE3_TYPE0, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE2_TYPE1, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE3_TYPE0, // south
+    mRF_GATE2_TYPE0  // east
+  },
+  {
+    mRF_GATE2_TYPE1, // north
+    mRF_GATE2_TYPE0, // west
+    mRF_GATE3_TYPE0, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE3_TYPE0, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE3_TYPE0, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE3_TYPE0, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE2_TYPE1, // south
+    mRF_GATE2_TYPE0  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE3_TYPE0, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE3_TYPE0  // east
+  },
+  {
+    mRF_GATE2_TYPE0, // north
+    mRF_GATE3_TYPE0, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE2_TYPE1  // east
+  },
+  {
+    mRF_GATE2_TYPE0, // north
+    mRF_GATE2_TYPE1, // west
+    mRF_GATE2_TYPE0, // south
+    mRF_GATE2_TYPE1  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE2_TYPE1, // west
+    mRF_GATE2_TYPE0, // south
+    mRF_GATE3_TYPE0  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE3_TYPE0, // west
+    mRF_GATE2_TYPE0, // south
+    mRF_GATE2_TYPE1  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE3_TYPE0, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE3_TYPE0  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE2_TYPE1, // west
+    mRF_GATE2_TYPE0, // south
+    mRF_GATE3_TYPE0  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE3_TYPE0, // west
+    mRF_GATE2_TYPE0, // south
+    mRF_GATE2_TYPE1  // east
+  },
+  {
+    mRF_GATE2_TYPE0, // north
+    mRF_GATE2_TYPE1, // west
+    mRF_GATE2_TYPE0, // south
+    mRF_GATE2_TYPE1  // east
+  },
+  {
+    mRF_GATE2_TYPE0, // north
+    mRF_GATE2_TYPE1, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE3_TYPE0  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE2_TYPE1, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE2_TYPE1, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE2_TYPE1, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE2_TYPE1  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE2_TYPE1, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE2_TYPE1  // east
+  },
+  {
+    mRF_GATE2_TYPE1, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE2_TYPE1  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE2_TYPE1, // west
+    mRF_GATE2_TYPE1, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE2_TYPE1, // north
+    mRF_GATE2_TYPE1, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE2_TYPE1, // south
+    mRF_GATE2_TYPE1  // east
+  },
+  {
+    mRF_GATE2_TYPE1, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE2_TYPE1, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE2_TYPE1, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE2_TYPE1  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE2_TYPE1, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE2_TYPE1  // east
+  },
+  {
+    mRF_GATE2_TYPE1, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE2_TYPE1  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE2_TYPE1, // west
+    mRF_GATE2_TYPE1, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE2_TYPE1, // north
+    mRF_GATE2_TYPE1, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE2_TYPE1, // south
+    mRF_GATE2_TYPE1  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE2_TYPE0, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE2_TYPE0  // east
+  },
+  {
+    mRF_GATE2_TYPE0, // north
+    mRF_GATE2_TYPE0, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE2_TYPE0, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE2_TYPE0, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE2_TYPE0, // south
+    mRF_GATE2_TYPE0  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE2_TYPE0, // west
+    mRF_GATE2_TYPE0, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE2_TYPE0, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE2_TYPE0, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE2_TYPE0, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE2_TYPE0  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE2_TYPE1, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE1_TYPE1, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE1_TYPE1  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE1_TYPE1, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE1_TYPE1  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE2_TYPE1, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE2_TYPE1, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE2_TYPE1, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE2_TYPE1  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE2_TYPE1, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE2_TYPE1  // east
+  },
+  {
+    mRF_GATE2_TYPE1, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE2_TYPE1  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE2_TYPE1, // west
+    mRF_GATE2_TYPE1, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE2_TYPE1, // north
+    mRF_GATE2_TYPE1, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE2_TYPE1, // south
+    mRF_GATE2_TYPE1  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE2_TYPE1, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE1_TYPE1, // west
+    mRF_GATE2_TYPE1, // south
+    mRF_GATE1_TYPE1  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE3_TYPE0, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE3_TYPE0  // east
+  },
+  {
+    mRF_GATE3_TYPE0, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE3_TYPE0, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE2_TYPE1, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE3_TYPE0, // south
+    mRF_GATE2_TYPE0  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE2_TYPE1, // west
+    mRF_GATE2_TYPE0, // south
+    mRF_GATE3_TYPE0  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE3_TYPE0, // west
+    mRF_GATE2_TYPE0, // south
+    mRF_GATE2_TYPE1  // east
+  },
+  {
+    mRF_GATE3_TYPE0, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE3_TYPE0, // south
+    mRF_GATE1_TYPE0  // east
+  },
+  {
+    mRF_GATE3_TYPE0, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE2_TYPE1, // south
+    mRF_GATE2_TYPE0  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE1_TYPE0, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE_NONE, // north
+    mRF_GATE_NONE, // west
+    mRF_GATE_NONE, // south
+    mRF_GATE_NONE  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE3_TYPE0, // west
+    mRF_GATE1_TYPE0, // south
+    mRF_GATE3_TYPE0  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE2_TYPE1, // west
+    mRF_GATE2_TYPE0, // south
+    mRF_GATE3_TYPE0  // east
+  },
+  {
+    mRF_GATE1_TYPE0, // north
+    mRF_GATE3_TYPE0, // west
+    mRF_GATE2_TYPE0, // south
+    mRF_GATE2_TYPE1  // east
+  }
+};
+
+static int mRF_BlockTypeDirect2GateType(u8 block_type, int direct) {
+  return mRF_gate_info2[block_type][direct];
+}
+
+
+extern mRF_gate_c* mRF_BlockTypeDirect2GateData(int* gate_count, u8 block_type, int direct) {
+  int type = mRF_BlockTypeDirect2GateType(block_type, direct);
+  int count = mRF_GateType2GateCount(type);
+
+  *gate_count = count;
+  return mRF_gate_correct_info[type][direct];
+}
+
+static int mRF_BlockInf2CheckBeastRoad(u8 block_type, mCoBG_Collision_u* collision_data) {
+  int i;
+  int j;
+  xyz_t wpos = { 0.0f, 0.0f, 0.0f };
+  int changed_attribute_count = 0;
+  int col_ut;
+  mCoBG_Collision_u* col;
+  u32 attrib;
+
+  for (i = 0; i < mRF_DIRECT_NUM; i++) {
+    int gate_count;
+    mRF_gate_c* gate_p = mRF_BlockTypeDirect2GateData(&gate_count, block_type, i);
+
+    if (gate_p != NULL) {
+      for (j = 0; j < gate_count; j++) {
+        /* process first unit */
+        {
+          col_ut = gate_p[j].ut0;
+          col = collision_data + (u8)col_ut;
+          attrib = col->data.unit_attribute;
+          
+          mFI_UtNum2CenterWpos(&wpos, col_ut & 0xF, (col_ut >> 4) & 0xF);
+
+          /* only bother updating the unit attribute if the unit can grow collideable plants in it */
+          if (mCoBG_Attribute2CheckPlant(attrib, &wpos) > 0) {
+            u32 new_attrib = mRF_Attr2BeastRoadAttr(attrib);
+            changed_attribute_count++;
+
+            col->data.unit_attribute = new_attrib;
+          }
+        }
+
+        /* process second unit */
+        {
+          col_ut = gate_p[j].ut1;
+          col = collision_data + (u8)col_ut;
+          attrib = col->data.unit_attribute;
+          
+          mFI_UtNum2CenterWpos(&wpos, col_ut & 0xF, (col_ut >> 4) & 0xF);
+
+          /* only bother updating the unit attribute if the unit can grow collideable plants in it */
+          if (mCoBG_Attribute2CheckPlant(attrib, &wpos) > 0) {
+            u32 new_attrib = mRF_Attr2BeastRoadAttr(attrib);
+            changed_attribute_count++;
+
+            col->data.unit_attribute = new_attrib;
+          }
+        }
+      }
+    }
+  }
+
+  return !changed_attribute_count;
+}
+
+extern void mRF_CheckBeastRoad() {
+  if (Save_Get(scene_no) == SCENE_FG) {
+    int max_bx = mFI_GetBlockXMax() - 1;
+    int max_bz = mFI_GetBlockZMax() - 1;
+    
+    int block_x;
+    int block_z;
+
+    for (block_z = 1; block_z < max_bz; block_z++) {
+      for (block_x = 1; block_x < max_bx; block_x++) {
+        mCoBG_Collision_u* collision_data = mFI_GetBkNum2ColTop(block_x, block_z);
+        u8 type = mFI_BkNum2BlockType(block_x, block_z);
+
+        mRF_BlockInf2CheckBeastRoad(type, collision_data);
+      }
+    }
+  }
+}
+
+static u8 l_river_next_direct[mRF_RIVER_NUM] = {
+  mRF_DIRECT_SOUTH,
+  mRF_DIRECT_EAST,
+  mRF_DIRECT_WEST,
+  mRF_DIRECT_EAST,
+  mRF_DIRECT_SOUTH,
+  mRF_DIRECT_WEST,
+  mRF_DIRECT_SOUTH
+};
+
+extern int mRF_RiverIdx2NextDirect(int river_idx) {
+  if (river_idx >= mRF_RIVER0 && river_idx < mRF_RIVER_NUM) {
+    return l_river_next_direct[river_idx];
+  }
+
+  return mRF_DIRECT_SOUTH;
+}
+
+extern int mRF_BlockType2RiverNextDirect(u8 type) {
+  u32 block_kind = mRF_Type2BlockInfo(type);
+  u32 river_kinds[mRF_RIVER_NUM] = {
+    mRF_BLOCKKIND_RIVER0,
+    mRF_BLOCKKIND_RIVER1,
+    mRF_BLOCKKIND_RIVER2,
+    mRF_BLOCKKIND_RIVER3,
+    mRF_BLOCKKIND_RIVER4,
+    mRF_BLOCKKIND_RIVER5,
+    mRF_BLOCKKIND_RIVER6
+  };
+
+  int i;
+
+  for (i = 0; i < mRF_RIVER_NUM; i++) {
+    if ((block_kind & river_kinds[i]) != 0) {
+      return mRF_RiverIdx2NextDirect(i);
+    }
+  }
+
+  return mRF_DIRECT_ERROR;
+}
+
+static int mRF_FindBgNameTypeCombiNum(mActor_name_t bg_id, u8 type) {
+  mFM_combo_info_c* combo_info = data_combi_table;
+  int combi_num = data_combi_table_number;
+  int i;
+
+  for (i = 0; i < combi_num; i++) {
+    if (combo_info->bg_id == bg_id && combo_info->type == type) {
+      return i;
+    }
+    combo_info++;
+  }
+
+  return 0;
+}
+
+extern void mRF_IslandBgData_To_VillageData() {
+  int left_bg_idx = Save_Get(island.bg_data[0]) & 3;
+  int right_bg_idx = Save_Get(island.bg_data[1]) & 3;
+  int island_left_bx;
+  int island_left_bz;
+  /* TODO: enums for these */    
+  mActor_name_t left_t = left_bg_idx + 0x74;
+  mActor_name_t right_t = right_bg_idx + 0x70;
+
+  if (mFI_BlockKind2BkNum(&island_left_bx, &island_left_bz, mRF_BLOCKKIND_ISLAND_LEFT)) {
+    mActor_name_t left_bg_name = mRF_FindBgNameTypeCombiNum(left_t, 0x62);
+    mActor_name_t right_bg_name = mRF_FindBgNameTypeCombiNum(right_t, 0x63);
+    
+    Save_Set(combi_table[island_left_bz][island_left_bx].combination_type, left_bg_name);
+    Save_Set(combi_table[island_left_bz][island_left_bx + 1].combination_type, right_bg_name);
+  }
+}
+
+extern int mRF_CheckFieldStep3() {
+  return Save_Get(combi_table[0][0]).height == mRF_FIELD_STEP3;
+}