diff --git a/ld/stage1.ld b/ld/stage1.ld
index 0e74cce4c..fdece7ba8 100644
--- a/ld/stage1.ld
+++ b/ld/stage1.ld
@@ -37,6 +37,7 @@ SECTIONS
 		src/game/game_000850.o (.text);
 		src/game/game_000860.o (.text);
 		src/game/game_000870.o (.text);
+		src/game/game_000880.o (.text);
 		src/game/game_0008e0.o (.text);
 		src/game/game_0008f0.o (.text);
 		src/game/game_000900.o (.text);
@@ -120,6 +121,7 @@ SECTIONS
 		src/game/game_000850.o (.rodata);
 		src/game/game_000860.o (.rodata);
 		src/game/game_000870.o (.rodata);
+		src/game/game_000880.o (.rodata);
 		src/game/game_0008e0.o (.rodata);
 		src/game/game_0008f0.o (.rodata);
 		src/game/game_000900.o (.rodata);
diff --git a/src/game/game_000870.c b/src/game/game_000870.c
index 7f3c2dd7e..efd7bf11c 100644
--- a/src/game/game_000870.c
+++ b/src/game/game_000870.c
@@ -1,49 +1,10 @@
 #include <ultra64.h>
 #include "constants.h"
 #include "gvars/gvars.h"
-#include "setup/setup_000000.h"
-#include "setup/setup_0160b0.h"
-#include "setup/setup_020df0.h"
 #include "types.h"
 #include "library/library.h"
 
-const u32 var7f1a78d0[] = {0x3dcccccd};
-const u32 var7f1a78d4[] = {0x3e4ccccd};
-const u32 var7f1a78d8[] = {0x00000000};
-const u32 var7f1a78dc[] = {0x00000000};
-
-GLOBAL_ASM(
-glabel func0f000870
-/*  f000870:	03e00008 */ 	jr	$ra
-/*  f000874:	00000000 */ 	sll	$zero,$zero,0x0
-/*  f000878:	00000000 */ 	sll	$zero,$zero,0x0
-/*  f00087c:	00000000 */ 	sll	$zero,$zero,0x0
-);
-
-GLOBAL_ASM(
-glabel func0f000880
-/*  f000880:	3c017f1a */ 	lui	$at,%hi(var7f1a78d0)
-/*  f000884:	c42078d0 */ 	lwc1	$f0,%lo(var7f1a78d0)($at)
-/*  f000888:	27bdffe8 */ 	addiu	$sp,$sp,-24
-/*  f00088c:	afbf0014 */ 	sw	$ra,0x14($sp)
-/*  f000890:	3c04800a */ 	lui	$a0,%hi(var800a3448)
-/*  f000894:	44050000 */ 	mfc1	$a1,$f0
-/*  f000898:	44060000 */ 	mfc1	$a2,$f0
-/*  f00089c:	44070000 */ 	mfc1	$a3,$f0
-/*  f0008a0:	0c014039 */ 	jal	func000500e4
-/*  f0008a4:	24843448 */ 	addiu	$a0,$a0,%lo(var800a3448)
-/*  f0008a8:	3c017f1a */ 	lui	$at,%hi(var7f1a78d4)
-/*  f0008ac:	c42078d4 */ 	lwc1	$f0,%lo(var7f1a78d4)($at)
-/*  f0008b0:	3c04800a */ 	lui	$a0,%hi(var800a3488)
-/*  f0008b4:	24843488 */ 	addiu	$a0,$a0,%lo(var800a3488)
-/*  f0008b8:	44050000 */ 	mfc1	$a1,$f0
-/*  f0008bc:	44060000 */ 	mfc1	$a2,$f0
-/*  f0008c0:	44070000 */ 	mfc1	$a3,$f0
-/*  f0008c4:	0c014039 */ 	jal	func000500e4
-/*  f0008c8:	00000000 */ 	sll	$zero,$zero,0x0
-/*  f0008cc:	8fbf0014 */ 	lw	$ra,0x14($sp)
-/*  f0008d0:	27bd0018 */ 	addiu	$sp,$sp,0x18
-/*  f0008d4:	03e00008 */ 	jr	$ra
-/*  f0008d8:	00000000 */ 	sll	$zero,$zero,0x0
-/*  f0008dc:	00000000 */ 	sll	$zero,$zero,0x0
-);
+void func0f000870(void)
+{
+	// empty
+}
diff --git a/src/game/game_000880.c b/src/game/game_000880.c
new file mode 100644
index 000000000..b36ec08f3
--- /dev/null
+++ b/src/game/game_000880.c
@@ -0,0 +1,11 @@
+#include <ultra64.h>
+#include "constants.h"
+#include "gvars/gvars.h"
+#include "types.h"
+#include "library/library.h"
+
+void func0f000880(void)
+{
+	func000500e4(&var800a3448, 0.1, 0.1, 0.1);
+	func000500e4(&var800a3488, 0.2, 0.2, 0.2);
+}
diff --git a/src/game/game_015420.c b/src/game/game_015420.c
index d321b92e0..fc95efa7a 100644
--- a/src/game/game_015420.c
+++ b/src/game/game_015420.c
@@ -6,6 +6,10 @@
 #include "setup/setup_020df0.h"
 #include "types.h"
 
+/**
+ * Iterates an array of structs and sets their unk04 value to 0.
+ * The array is stored at 800a45c4 and each struct is 0x6c long.
+ */
 GLOBAL_ASM(
 glabel func0f015420
 /*  f015420:	3c04800a */ 	lui	$a0,%hi(var800a45c0)
@@ -30,4 +34,4 @@ glabel func0f015420
 /*  f015464:	03e00008 */ 	jr	$ra
 /*  f015468:	00000000 */ 	sll	$zero,$zero,0x0
 /*  f01546c:	00000000 */ 	sll	$zero,$zero,0x0
-);
\ No newline at end of file
+);
diff --git a/src/include/game/game_000870.h b/src/include/game/game_000870.h
index fad611070..d68cc69fe 100644
--- a/src/include/game/game_000870.h
+++ b/src/include/game/game_000870.h
@@ -3,7 +3,6 @@
 #include <ultra64.h>
 #include "types.h"
 
-u32 func0f000870(void);
-u32 func0f000880(void);
+void func0f000870(void);
 
 #endif
diff --git a/src/include/game/game_000880.h b/src/include/game/game_000880.h
new file mode 100644
index 000000000..3d87b0b29
--- /dev/null
+++ b/src/include/game/game_000880.h
@@ -0,0 +1,8 @@
+#ifndef IN_GAME_GAME_000880_H
+#define IN_GAME_GAME_000880_H
+#include <ultra64.h>
+#include "types.h"
+
+void func0f000880(void);
+
+#endif
diff --git a/src/include/library/library.h b/src/include/library/library.h
index 5be4afa06..8a12a19b4 100644
--- a/src/include/library/library.h
+++ b/src/include/library/library.h
@@ -72,7 +72,7 @@ u32 func0000bee0(void);
 u32 func0000bf04(void);
 u32 func0000bfd0(void);
 void func0000cf54(void);
-u32 func0000d410(void);
+void func0000d410(s32 arg0, s32 arg1, s32 arg2);
 u32 func0000d488(void);
 void func0000dae8(void);
 u32 func0000db30(void);
@@ -103,7 +103,7 @@ u32 func0001190c(void);
 u32 func00011d84(void);
 u32 func000122e0(void);
 u32 func00012324(void);
-u32 func000123c8(void);
+s32 func000123c8(s32 arg0, s32 arg1, s32 arg2);
 u32 func00012430(void);
 u32 func000124d4(void);
 u32 func00012528(void);
@@ -401,7 +401,7 @@ u32 func0004e650(void);
 u32 func0004f854(void);
 u32 func0004fe20(void);
 u32 func00050090(void);
-u32 func000500e4(void);
+void func000500e4(u32 *ptr, float arg1, float arg2, float arg3);
 u32 func00050130(void);
 u32 func000503f0(void);
 u32 func00050554(void);