diff --git a/configure.py b/configure.py
index 987a0fb79..0eac1193a 100644
--- a/configure.py
+++ b/configure.py
@@ -1551,7 +1551,7 @@ config.libs = [
     ActorRel(NonMatching, "d_a_obj_iceisland"),
     ActorRel(NonMatching, "d_a_obj_jump"),
     ActorRel(NonMatching, "d_a_obj_kanoke"),
-    ActorRel(NonMatching, "d_a_obj_ladder"),
+    ActorRel(NonMatching, "d_a_obj_ladder", extra_cflags=['-pragma "nosyminline on"']),
     ActorRel(NonMatching, "d_a_obj_light"),
     ActorRel(NonMatching, "d_a_obj_mkie"),
     ActorRel(NonMatching, "d_a_obj_mkiek"),
diff --git a/include/d/actor/d_a_obj_ladder.h b/include/d/actor/d_a_obj_ladder.h
index 1be60b9df..1f4cc497f 100644
--- a/include/d/actor/d_a_obj_ladder.h
+++ b/include/d/actor/d_a_obj_ladder.h
@@ -1,20 +1,50 @@
 #ifndef D_A_OBJ_LADDER_H
 #define D_A_OBJ_LADDER_H
 
+#include "d/d_a_obj.h"
+#include "d/d_bg_s_gnd_chk.h"
+#include "d/d_bg_s_movebg_actor.h"
 #include "f_op/f_op_actor.h"
 
 namespace daObjLadder {
-    class Act_c : public fopAc_ac_c {
+    enum Type_e {
+        MHSG6_e,
+        MHSG9_e,
+        MHSG12_e,
+        MHSG15_e,
+        MHSG4H_e,
+    };
+
+    class Act_c : public dBgS_MoveBgActor {
     public:
-        void prm_get_evId() const {}
-        void prm_get_swSave() const {}
-        void prm_get_type() const {}
-    
-        void CreateHeap();
-        s32 Create();
-        void Mthd_Create();
+        enum Mode_e {
+            Mode_WAIT_e,
+            Mode_DEMOREQ_e,
+            Mode_VIB_e,
+            Mode_DROP_e,
+            Mode_FELL_e,
+        };
+
+        enum Prm_e {
+            PRM_EV_ID_W = 0x08,
+            PRM_EV_ID_S = 0x10,
+
+            PRM_SWSAVE_W = 0x08,
+            PRM_SWSAVE_S = 0x08,
+
+            PRM_TYPE_W = 0x03,
+            PRM_TYPE_S = 0x00,
+        };
+
+        u8 prm_get_evId() const { return daObj::PrmAbstract<Prm_e>(this, PRM_EV_ID_W, PRM_EV_ID_S); }
+        s32 prm_get_swSave() const { return daObj::PrmAbstract<Prm_e>(this, PRM_SWSAVE_W, PRM_SWSAVE_S); }
+        Type_e prm_get_type() const { return (Type_e)daObj::PrmAbstract<Prm_e>(this, PRM_TYPE_W, PRM_TYPE_S); }
+
+        BOOL CreateHeap();
+        int Create();
+        s32 Mthd_Create();
         BOOL Delete();
-        void Mthd_Delete();
+        BOOL Mthd_Delete();
         void demo_end_reset();
         void mode_wait_init();
         void mode_wait();
@@ -28,11 +58,27 @@ namespace daObjLadder {
         void mode_fell();
         void set_mtx();
         void init_mtx();
-        void Execute(float(**)[3][4]);
+        int Execute(Mtx**);
         BOOL Draw();
-    
+
+        static Mtx M_tmp_mtx;
+        static const char M_arcname[];
+
     public:
-        /* Place member variables here */
+        /* 0x2C8 */ request_of_phase_process_class mPhs;
+        /* 0x2D0 */ J3DModel* mpModel;
+        /* 0x2D4 */ Type_e mType;
+        /* 0x2D8 */ Mode_e mMode;
+        /* 0x2DC */ s16 unk2DC;
+        /* 0x2DE */ s16 unk2DE;
+        /* 0x2E0 */ f32 mGndY;
+        /* 0x2E4 */ dBgS_ObjGndChk mGndChk;
+        /* 0x338 */ s16 unk338;
+        /* 0x33A */ s16 unk33A;
+        /* 0x33C */ f32 unk33C;
+        /* 0x340 */ f32 unk340;
+        /* 0x344 */ s16 mEventIdx;
+        /* 0x346 */ u8 unk346;
     };
 };
 
diff --git a/src/d/actor/d_a_obj_ladder.cpp b/src/d/actor/d_a_obj_ladder.cpp
index 4e86bec8e..8e923bd05 100644
--- a/src/d/actor/d_a_obj_ladder.cpp
+++ b/src/d/actor/d_a_obj_ladder.cpp
@@ -4,133 +4,332 @@
 //
 
 #include "d/actor/d_a_obj_ladder.h"
+#include "d/res/res_mhsg.h"
+#include "d/d_com_inf_game.h"
 #include "d/d_procname.h"
 
+// Needed for .data to match.
+static f32 dummy1[3] = {1.0f, 1.0f, 1.0f};
+static f32 dummy2[3] = {1.0f, 1.0f, 1.0f};
+static u8 dummy3[4] = {0x02, 0x00, 0x02, 0x01};
+static f64 dummy4[2] = {3.0, 0.5};
+
+Mtx daObjLadder::Act_c::M_tmp_mtx;
+
+namespace daObjLadder {
+    namespace {
+        struct Attr_c {
+            /* 0x00 */ f32 field_0x00;
+            /* 0x04 */ f32 field_0x04;
+            /* 0x08 */ f32 field_0x08;
+            /* 0x0C */ f32 field_0x0C;
+            /* 0x10 */ u8 field_0x10;
+            /* 0x11 */ u8 field_0x11;
+            /* 0x12 */ u8 field_0x12;
+            /* 0x13 */ u8 field_0x13;
+            /* 0x14 */ u8 field_0x14;
+            /* 0x16 */ s16 field_0x16;
+            /* 0x18 */ s16 field_0x18;
+            /* 0x1A */ s16 field_0x1A;
+            /* 0x1C */ f32 field_0x1C;
+            /* 0x20 */ f32 field_0x20;
+        };
+
+        static const Attr_c L_attr = { // TODO: Figure out what these are
+            -3.0f, 0.005f, 0.0005f, 0.5f,
+            3, 75, 50, 45, 40,
+            20000, 0x3CC3, 0x000F,
+            2.0f, 1.0f,
+        };
+
+        inline const Attr_c & attr() { return L_attr; }
+
+        struct AttrType {
+            s16 modelId;
+            s16 dzbId;
+            f32 field_0x04;
+        };
+
+        static AttrType L_attr_type[] = {
+            {MHSG_BDL_MHSG6, MHSG_DZB_MHSG6, 600.0f},
+            {MHSG_BDL_MHSG9, MHSG_DZB_MHSG9, 900.0f},
+            {MHSG_BDL_MHSG12, MHSG_DZB_MHSG12, 1200.0f},
+            {MHSG_BDL_MHSG15, MHSG_DZB_MHSG15, 1500.0f},
+            {MHSG_BDL_MHSG4H, MHSG_DZB_MHSG4H, 450.0f},
+        };
+
+        inline const AttrType& attr_type(Type_e type) { return L_attr_type[type]; }
+    }
+}
+
+const char daObjLadder::Act_c::M_arcname[] = "Mhsg";
+
 /* 00000078-0000013C       .text CreateHeap__Q211daObjLadder5Act_cFv */
-void daObjLadder::Act_c::CreateHeap() {
-    /* Nonmatching */
+BOOL daObjLadder::Act_c::CreateHeap() {
+    J3DModelData* model_data = static_cast<J3DModelData*>(dComIfG_getObjectRes(M_arcname, attr_type(mType).modelId));
+    JUT_ASSERT(0x17E, model_data != 0);
+
+    mpModel = mDoExt_J3DModel__create(model_data, 0x80000U, 0x11000022U);
+
+    return mpModel != NULL;
 }
 
 /* 0000013C-000002F0       .text Create__Q211daObjLadder5Act_cFv */
-s32 daObjLadder::Act_c::Create() {
-    /* Nonmatching */
+int daObjLadder::Act_c::Create() {
+    fopAcM_SetMtx(this, mpModel->getBaseTRMtx());
+    init_mtx();
+
+    fopAcM_setCullSizeBox(this, -55.0f, -1.0f, -10.0f, 55.0f, attr_type(mType).field_0x04 + 41.0f, 10.0f);
+
+    cXyz pos;
+    mDoMtx_stack_c::push();
+    mDoMtx_stack_c::transS(current.pos);
+    mDoMtx_stack_c::YrotM(shape_angle.y);
+    mDoMtx_stack_c::transM(0.0f, 10.0f, 5.0f);
+    mDoMtx_stack_c::multVec(&cXyz::Zero, &pos);
+    mDoMtx_stack_c::pop();
+
+    mGndChk.SetPos(&pos);
+    mGndChk.SetActorPid(base.mBsPcId);
+    mGndY = dComIfG_Bgsp()->GroundCross(&mGndChk);
+    unk346 = 0;
+
+    mEventIdx = dComIfGp_evmng_getEventIdx(NULL, prm_get_evId());
+
+    if (prm_get_swSave() == 0xFF || fopAcM_isSwitch(this, prm_get_swSave())) {
+        current.pos.y = mGndY;
+        set_mtx();
+        mode_fell_init();
+    } else {
+        mode_wait_init();
+    }
+
+    return TRUE;
 }
 
 /* 000002F0-000004F8       .text Mthd_Create__Q211daObjLadder5Act_cFv */
-void daObjLadder::Act_c::Mthd_Create() {
-    /* Nonmatching */
+s32 daObjLadder::Act_c::Mthd_Create() {
+    fopAcM_SetupActor(this, Act_c);
+    s32 phase_state = dComIfG_resLoad(&mPhs, M_arcname);
+
+    if (phase_state == cPhs_COMPLEATE_e) {
+        mType = prm_get_type();
+        phase_state = MoveBGCreate(M_arcname, attr_type(mType).dzbId, dBgS_MoveBGProc_Trans, 0x900);
+
+        JUT_ASSERT(0x1DE, (phase_state == cPhs_COMPLEATE_e) || (phase_state == cPhs_ERROR_e));
+    }
+
+    return phase_state;
 }
 
 /* 000009B8-000009C0       .text Delete__Q211daObjLadder5Act_cFv */
 BOOL daObjLadder::Act_c::Delete() {
-    /* Nonmatching */
+    return TRUE;
 }
 
 /* 000009C0-00000A0C       .text Mthd_Delete__Q211daObjLadder5Act_cFv */
-void daObjLadder::Act_c::Mthd_Delete() {
-    /* Nonmatching */
+BOOL daObjLadder::Act_c::Mthd_Delete() {
+    BOOL res = MoveBGDelete();
+
+    dComIfG_resDelete(&mPhs, M_arcname);
+
+    return res;
 }
 
 /* 00000A0C-00000A78       .text demo_end_reset__Q211daObjLadder5Act_cFv */
 void daObjLadder::Act_c::demo_end_reset() {
-    /* Nonmatching */
+    if (unk346 && dComIfGp_evmng_endCheck(mEventIdx)) {
+        dComIfGp_event_reset();
+        unk346 = 0;
+    }
 }
 
 /* 00000A78-00000A84       .text mode_wait_init__Q211daObjLadder5Act_cFv */
 void daObjLadder::Act_c::mode_wait_init() {
-    /* Nonmatching */
+    mMode = Mode_WAIT_e;
 }
 
 /* 00000A84-00000AE0       .text mode_wait__Q211daObjLadder5Act_cFv */
 void daObjLadder::Act_c::mode_wait() {
-    /* Nonmatching */
+    if (fopAcM_isSwitch(this, prm_get_swSave())) {
+        mode_demoreq_init();
+    }
 }
 
 /* 00000AE0-00000AF4       .text mode_demoreq_init__Q211daObjLadder5Act_cFv */
 void daObjLadder::Act_c::mode_demoreq_init() {
-    /* Nonmatching */
+    mMode = Mode_DEMOREQ_e;
+    unk346 = 0;
 }
 
 /* 00000AF4-00000BB4       .text mode_demoreq__Q211daObjLadder5Act_cFv */
 void daObjLadder::Act_c::mode_demoreq() {
-    /* Nonmatching */
+    bool ret = false;
+    if (dComIfGp_evmng_existence(mEventIdx)) {
+        if (eventInfo.checkCommandDemoAccrpt()) {
+            ret = true;
+            unk346 = 1;
+        } else {
+            fopAcM_orderOtherEventId(this, mEventIdx, prm_get_evId());
+            eventInfo.onCondition(dEvtCnd_UNK2_e);
+        }
+    } else {
+        ret = true;
+    }
+
+    if (ret) {
+        mode_vib_init();
+    }
 }
 
 /* 00000BB4-00000BDC       .text mode_vib_init__Q211daObjLadder5Act_cFv */
 void daObjLadder::Act_c::mode_vib_init() {
-    /* Nonmatching */
+    unk2DC = attr().field_0x1A;
+    unk338 = 0;
+    unk33A = 0;
+    mMode = Mode_VIB_e;
 }
 
 /* 00000BDC-00000C98       .text mode_vib__Q211daObjLadder5Act_cFv */
 void daObjLadder::Act_c::mode_vib() {
-    /* Nonmatching */
+    unk338 += attr().field_0x16;
+    unk33A += attr().field_0x18;
+
+    unk33C = cM_scos(unk338) * attr().field_0x1C;
+    unk340 = cM_scos(unk33A) * attr().field_0x20;
+
+    if (--unk2DC <= 0) {
+        mode_drop_init();
+    }
 }
 
 /* 00000C98-00000CDC       .text mode_drop_init__Q211daObjLadder5Act_cFv */
 void daObjLadder::Act_c::mode_drop_init() {
-    /* Nonmatching */
+    gravity = -5.0f;
+    speed.set(cXyz::Zero);
+    unk2DE = attr().field_0x10;
+    mMode = Mode_DROP_e;
 }
 
 /* 00000CDC-00000EA8       .text mode_drop__Q211daObjLadder5Act_cFv */
 void daObjLadder::Act_c::mode_drop() {
-    /* Nonmatching */
+    daObj::posMoveF_stream(this, NULL, &cXyz::Zero, attr().field_0x04, attr().field_0x08);
+
+    if (current.pos.y < mGndY) {
+        if (unk2DE == attr().field_0x10) {
+            fopAcM_seStart(this, JA_SE_OBJ_LADDER_FALL_1, dComIfG_Bgsp()->GetMtrlSndId(mGndChk));
+
+            dComIfGp_getVibration().StartShock(4, -0x21, cXyz(0.0f, 1.0f, 0.0f));
+        } else {
+            s32 tmp = attr().field_0x10 - unk2DE;
+            s32 param_2;
+
+            if (tmp == 1) {
+                param_2 = attr().field_0x11;
+            } else if (tmp == 2) {
+                param_2 = attr().field_0x12;
+            } else if (tmp == 3) {
+                param_2 = attr().field_0x13;
+            } else {
+                param_2 = attr().field_0x14;
+            }
+
+            fopAcM_seStart(this, JA_SE_OBJ_LADDER_FALL_2, param_2);
+        }
+
+        if (unk2DE >= 0) {
+            unk2DE--;
+
+            current.pos.y = mGndY - (current.pos.y - mGndY) * 0.5f;
+            speed.y *= -0.5f;
+        } else {
+            current.pos.y = mGndY;
+            mode_fell_init();
+        }
+    }
 }
 
 /* 00000EA8-00000EB4       .text mode_fell_init__Q211daObjLadder5Act_cFv */
 void daObjLadder::Act_c::mode_fell_init() {
-    /* Nonmatching */
+    mMode = Mode_FELL_e;
 }
 
 /* 00000EB4-00000EB8       .text mode_fell__Q211daObjLadder5Act_cFv */
-void daObjLadder::Act_c::mode_fell() {
-    /* Nonmatching */
-}
+void daObjLadder::Act_c::mode_fell() {}
 
 /* 00000EB8-00000F4C       .text set_mtx__Q211daObjLadder5Act_cFv */
 void daObjLadder::Act_c::set_mtx() {
-    /* Nonmatching */
+    mDoMtx_stack_c::transS(current.pos);
+    mDoMtx_stack_c::ZXYrotM(shape_angle);
+    cMtx_copy(mDoMtx_stack_c::get(), M_tmp_mtx);
+
+    mDoMtx_stack_c::transM(unk33C, unk340, 0.0f);
+    mpModel->setBaseTRMtx(mDoMtx_stack_c::get());
 }
 
 /* 00000F4C-00000F88       .text init_mtx__Q211daObjLadder5Act_cFv */
 void daObjLadder::Act_c::init_mtx() {
-    /* Nonmatching */
+    mpModel->setBaseScale(scale);
+    set_mtx();
 }
 
 /* 00000F88-000010A0       .text Execute__Q211daObjLadder5Act_cFPPA3_A4_f */
-void daObjLadder::Act_c::Execute(float(**)[3][4]) {
-    /* Nonmatching */
+int daObjLadder::Act_c::Execute(Mtx** ppMtx) {
+    typedef void (Act_c::*ModeFunc)();
+    static const ModeFunc mode_proc[] = {
+        mode_wait,
+        mode_demoreq,
+        mode_vib,
+        mode_drop,
+        mode_fell,
+    };
+
+    demo_end_reset();
+    (this->*mode_proc[mMode])();
+    eyePos.y = current.pos.y;
+    set_mtx();
+    *ppMtx = &M_tmp_mtx;
+
+    return TRUE;
 }
 
 /* 000010A0-00001140       .text Draw__Q211daObjLadder5Act_cFv */
 BOOL daObjLadder::Act_c::Draw() {
-    /* Nonmatching */
+    g_env_light.settingTevStruct(TEV_TYPE_ACTOR, &current.pos, &tevStr);
+    g_env_light.setLightTevColorType(mpModel, &tevStr);
+
+    dComIfGd_setListBG();
+    mDoExt_modelUpdateDL(mpModel);
+    dComIfGd_setList();
+
+    return TRUE;
 }
 
 namespace daObjLadder {
 namespace {
 /* 00001140-00001160       .text Mthd_Create__Q211daObjLadder28@unnamed@d_a_obj_ladder_cpp@FPv */
-void Mthd_Create(void*) {
-    /* Nonmatching */
+static s32 Mthd_Create(void* i_this) {
+    return static_cast<Act_c*>(i_this)->Mthd_Create();
 }
 
 /* 00001160-00001180       .text Mthd_Delete__Q211daObjLadder28@unnamed@d_a_obj_ladder_cpp@FPv */
-void Mthd_Delete(void*) {
-    /* Nonmatching */
+static BOOL Mthd_Delete(void* i_this) {
+    return static_cast<Act_c*>(i_this)->Mthd_Delete();
 }
 
 /* 00001180-000011A0       .text Mthd_Execute__Q211daObjLadder28@unnamed@d_a_obj_ladder_cpp@FPv */
-void Mthd_Execute(void*) {
-    /* Nonmatching */
+static BOOL Mthd_Execute(void* i_this) {
+    return static_cast<Act_c*>(i_this)->MoveBGExecute();
 }
 
 /* 000011A0-000011CC       .text Mthd_Draw__Q211daObjLadder28@unnamed@d_a_obj_ladder_cpp@FPv */
-void Mthd_Draw(void*) {
-    /* Nonmatching */
+static BOOL Mthd_Draw(void* i_this) {
+    return static_cast<Act_c*>(i_this)->MoveBGDraw();
 }
 
 /* 000011CC-000011F8       .text Mthd_IsDelete__Q211daObjLadder28@unnamed@d_a_obj_ladder_cpp@FPv */
-void Mthd_IsDelete(void*) {
-    /* Nonmatching */
+static BOOL Mthd_IsDelete(void* i_this) {
+    return static_cast<Act_c*>(i_this)->MoveBGIsDelete();
 }
 
 static actor_method_class Mthd_Table = {