diff --git a/ld/stage1.ld b/ld/stage1.ld
index b512f7424..eec9e0ee2 100644
--- a/ld/stage1.ld
+++ b/ld/stage1.ld
@@ -19,6 +19,8 @@ SECTIONS
 
 	_antipiracyUncloakWriteAddress = 0x7002a324;
 
+	osCicId = 0x80000310;
+
 	__rompos = 0;
 	.boot 0x70001000 : AT(__rompos) {
 		src/boot/boot.o (.text);
diff --git a/src/game/chr/chraicommands.c b/src/game/chr/chraicommands.c
index 05dd0b8de..a1c091ba7 100644
--- a/src/game/chr/chraicommands.c
+++ b/src/game/chr/chraicommands.c
@@ -3450,15 +3450,15 @@ bool aiIfDoorState(void)
 	if (obj && obj->prop && obj->type == OBJTYPE_DOOR) {
 		struct doorobj *door = (struct doorobj *) obj;
 
-		if (door->state == 0) {
-			if (door->speed <= 0) {
+		if (door->mode == 0) {
+			if (door->frac <= 0) {
 				pass = (cmd[3] & DOORSTATEBIT_CLOSED) != 0;
 			} else {
 				pass = (cmd[3] & DOORSTATEBIT_OPEN) != 0;
 			}
-		} else if (door->state == 1 || door->state == 3) {
+		} else if (door->mode == 1 || door->mode == 3) {
 			pass = (cmd[3] & DOORSTATEBIT_OPENING) != 0;
-		} else if (door->state == 2) {
+		} else if (door->mode == 2) {
 			pass = (cmd[3] & DOORSTATEBIT_CLOSING) != 0;
 		}
 	}
@@ -3500,7 +3500,7 @@ bool aiLockDoor(void)
 	if (obj && obj->prop && obj->prop->type == PROPTYPE_DOOR) {
 		struct doorobj *door = (struct doorobj *) obj;
 		u8 bits = cmd[3];
-		door->lockbits = door->lockbits | bits;
+		door->keyflags = door->keyflags | bits;
 	}
 
 	g_Vars.aioffset += 4;
@@ -3519,7 +3519,7 @@ bool aiUnlockDoor(void)
 	if (obj && obj->prop && obj->prop->type == PROPTYPE_DOOR) {
 		struct doorobj *door = (struct doorobj *) obj;
 		u8 bits = cmd[3];
-		door->lockbits = door->lockbits & ~bits;
+		door->keyflags = door->keyflags & ~bits;
 	}
 
 	g_Vars.aioffset += 4;
@@ -3539,9 +3539,9 @@ bool aiIfDoorLocked(void)
 	if (obj && obj->prop && obj->prop->type == PROPTYPE_DOOR) {
 		struct doorobj *door = (struct doorobj *) obj;
 		u32 bits = cmd[3];
-		u32 lockbits = door->lockbits;
+		u32 keyflags = door->keyflags;
 
-		if ((lockbits & bits) == bits) {
+		if ((keyflags & bits) == bits) {
 			pass = true;
 		}
 	}
@@ -7478,17 +7478,17 @@ bool ai00e5(void)
 /**
  * @cmd 00e8
  */
-bool aiSetDoorClosed(void)
+bool aiSetDoorOpen(void)
 {
 	u8 *cmd = g_Vars.ailist + g_Vars.aioffset;
 	struct defaultobj *obj = objFindByTagId(cmd[2]);
 
 	if (obj && obj->prop) {
 		struct doorobj *door = (struct doorobj *) obj;
-		door->speed = door->unk5c;
-		door->unk80 = 0;
-		door->unkc0 = g_Vars.lvframe60;
-		door->state = 0;
+		door->frac = door->maxfrac;
+		door->fracspeed = 0;
+		door->lastopen60 = g_Vars.lvframe60;
+		door->mode = 0;
 		func0f08c54c(door);
 		func0f08d4e8(door);
 		func0f0926bc(door->base.prop, 1, 0xffff);
diff --git a/src/game/game_066310.c b/src/game/game_066310.c
index 8779adeda..3715abbf5 100644
--- a/src/game/game_066310.c
+++ b/src/game/game_066310.c
@@ -46294,13 +46294,10 @@ glabel func0f08e1a0
 /*  f08e210:	00000000 */ 	sll	$zero,$zero,0x0
 );
 
-GLOBAL_ASM(
-glabel func0f08e214
-/*  f08e214:	3c01aaaa */ 	lui	$at,0xaaaa
-/*  f08e218:	3421aaaa */ 	ori	$at,$at,0xaaaa
-/*  f08e21c:	03e00008 */ 	jr	$ra
-/*  f08e220:	00811026 */ 	xor	$v0,$a0,$at
-);
+u32 decodeXorAaaaaaaa(u32 value)
+{
+	return value ^ 0xaaaaaaaa;
+}
 
 GLOBAL_ASM(
 glabel func0f08e224
@@ -46342,77 +46339,44 @@ glabel func0f08e224
 /*  f08e2a8:	00000000 */ 	sll	$zero,$zero,0x0
 );
 
-GLOBAL_ASM(
-glabel func0f08e2ac
-/*  f08e2ac:	27bdffe0 */ 	addiu	$sp,$sp,-32
-/*  f08e2b0:	afbf0014 */ 	sw	$ra,0x14($sp)
-/*  f08e2b4:	00803025 */ 	or	$a2,$a0,$zero
-/*  f08e2b8:	24030001 */ 	addiu	$v1,$zero,0x1
-/*  f08e2bc:	8cc50014 */ 	lw	$a1,0x14($a2)
-/*  f08e2c0:	808400c6 */ 	lb	$a0,0xc6($a0)
-/*  f08e2c4:	afa60020 */ 	sw	$a2,0x20($sp)
-/*  f08e2c8:	0fc237c4 */ 	jal	func0f08df10
-/*  f08e2cc:	afa3001c */ 	sw	$v1,0x1c($sp)
-/*  f08e2d0:	8fa60020 */ 	lw	$a2,0x20($sp)
-/*  f08e2d4:	8fa3001c */ 	lw	$v1,0x1c($sp)
-/*  f08e2d8:	10c00012 */ 	beqz	$a2,.L0f08e324
-/*  f08e2dc:	00c01025 */ 	or	$v0,$a2,$zero
-/*  f08e2e0:	44800000 */ 	mtc1	$zero,$f0
-/*  f08e2e4:	00000000 */ 	sll	$zero,$zero,0x0
-/*  f08e2e8:	c444007c */ 	lwc1	$f4,0x7c($v0)
-.L0f08e2ec:
-/*  f08e2ec:	4604003c */ 	c.lt.s	$f0,$f4
-/*  f08e2f0:	00000000 */ 	sll	$zero,$zero,0x0
-/*  f08e2f4:	45020007 */ 	bc1fl	.L0f08e314
-/*  f08e2f8:	8c4200bc */ 	lw	$v0,0xbc($v0)
-/*  f08e2fc:	84ce00c4 */ 	lh	$t6,0xc4($a2)
-/*  f08e300:	844f00c4 */ 	lh	$t7,0xc4($v0)
-/*  f08e304:	55cf0003 */ 	bnel	$t6,$t7,.L0f08e314
-/*  f08e308:	8c4200bc */ 	lw	$v0,0xbc($v0)
-/*  f08e30c:	00001825 */ 	or	$v1,$zero,$zero
-/*  f08e310:	8c4200bc */ 	lw	$v0,0xbc($v0)
-.L0f08e314:
-/*  f08e314:	10460003 */ 	beq	$v0,$a2,.L0f08e324
-/*  f08e318:	00000000 */ 	sll	$zero,$zero,0x0
-/*  f08e31c:	5440fff3 */ 	bnezl	$v0,.L0f08e2ec
-/*  f08e320:	c444007c */ 	lwc1	$f4,0x7c($v0)
-.L0f08e324:
-/*  f08e324:	10600004 */ 	beqz	$v1,.L0f08e338
-/*  f08e328:	00c02025 */ 	or	$a0,$a2,$zero
-/*  f08e32c:	0fc23545 */ 	jal	func0f08d514
-/*  f08e330:	afa60020 */ 	sw	$a2,0x20($sp)
-/*  f08e334:	8fa60020 */ 	lw	$a2,0x20($sp)
-.L0f08e338:
-/*  f08e338:	94d80072 */ 	lhu	$t8,0x72($a2)
-/*  f08e33c:	2401000b */ 	addiu	$at,$zero,0xb
-/*  f08e340:	3c04aaaa */ 	lui	$a0,0xaaaa
-/*  f08e344:	17010006 */ 	bne	$t8,$at,.L0f08e360
-/*  f08e348:	00000000 */ 	sll	$zero,$zero,0x0
-/*  f08e34c:	80d900c7 */ 	lb	$t9,0xc7($a2)
-/*  f08e350:	240800ff */ 	addiu	$t0,$zero,0xff
-/*  f08e354:	17200002 */ 	bnez	$t9,.L0f08e360
-/*  f08e358:	00000000 */ 	sll	$zero,$zero,0x0
-/*  f08e35c:	a0c800cc */ 	sb	$t0,0xcc($a2)
-.L0f08e360:
-/*  f08e360:	0fc23885 */ 	jal	func0f08e214
-/*  f08e364:	3484bd73 */ 	ori	$a0,$a0,0xbd73
-/*  f08e368:	3c098000 */ 	lui	$t1,0x8000
-/*  f08e36c:	8d290310 */ 	lw	$t1,0x310($t1)
-/*  f08e370:	3c0b03e0 */ 	lui	$t3,0x3e0
-/*  f08e374:	240a1025 */ 	addiu	$t2,$zero,0x1025
-/*  f08e378:	10490006 */ 	beq	$v0,$t1,.L0f08e394
-/*  f08e37c:	356b0008 */ 	ori	$t3,$t3,0x8
-/*  f08e380:	3c027f09 */ 	lui	$v0,0x7f09
-/*  f08e384:	2442f968 */ 	addiu	$v0,$v0,-1688
-/*  f08e388:	ac4a0000 */ 	sw	$t2,0x0($v0)
-/*  f08e38c:	ac4b0004 */ 	sw	$t3,0x4($v0)
-/*  f08e390:	ac400008 */ 	sw	$zero,0x8($v0)
-.L0f08e394:
-/*  f08e394:	8fbf0014 */ 	lw	$ra,0x14($sp)
-/*  f08e398:	27bd0020 */ 	addiu	$sp,$sp,0x20
-/*  f08e39c:	03e00008 */ 	jr	$ra
-/*  f08e3a0:	00000000 */ 	sll	$zero,$zero,0x0
-);
+void func0f08e2ac(struct doorobj *door)
+{
+	bool pass = true;
+	struct doorobj *loopdoor;
+
+	func0f08df10(door->soundtype, door->base.prop);
+
+	loopdoor = door;
+
+	while (loopdoor) {
+		if (loopdoor->frac > 0 && loopdoor->portal == door->portal) {
+			pass = false;
+		}
+
+		loopdoor = loopdoor->sibling;
+
+		if (loopdoor == door) {
+			break;
+		}
+	}
+
+	if (pass) {
+		func0f08d514(door);
+	}
+
+	if (door->doortype == DOORTYPE_LASER && door->fadetime60 == 0) {
+		door->laserfade = 255;
+	}
+
+#if PIRACYCHECKS
+	if (osCicId != decodeXorAaaaaaaa(0xaaaabd73)) {
+		u32 *ptr = (u32 *)func0f08f968;
+		ptr[0] = 0x00001025;
+		ptr[1] = 0x03e00008;
+		ptr[2] = 0x00000000;
+	}
+#endif
+}
 
 GLOBAL_ASM(
 glabel func0f08e3a4
diff --git a/src/include/constants.h b/src/include/constants.h
index ba22b7362..2af4ab6b3 100644
--- a/src/include/constants.h
+++ b/src/include/constants.h
@@ -351,6 +351,8 @@
 #define DOORSTATEBIT_CLOSING 4
 #define DOORSTATEBIT_OPENING 8
 
+#define DOORTYPE_LASER 11
+
 #define DRCAROLLIMAGE_DEAD 4
 
 #define ENTITYTYPE_CHR       0x0004
diff --git a/src/include/game/chr/chraicommands.h b/src/include/game/chr/chraicommands.h
index b0b65c884..34f7cd6ae 100644
--- a/src/include/game/chr/chraicommands.h
+++ b/src/include/game/chr/chraicommands.h
@@ -232,7 +232,7 @@
 /*0x00e3*/ bool ai00e3(void);
 /*0x00e4*/ bool ai00e4(void);
 /*0x00e5*/ bool ai00e5(void);
-/*0x00e8*/ bool aiSetDoorClosed(void);
+/*0x00e8*/ bool aiSetDoorOpen(void);
 /*0x00e9*/ bool ai00e9(void);
 /*0x00ea*/ bool aiIfNumPlayersLessThan(void);
 /*0x00eb*/ bool aiIfChrAmmoQuantityLessThan(void);
diff --git a/src/include/game/game_066310.h b/src/include/game/game_066310.h
index b617b85fa..add7511a1 100644
--- a/src/include/game/game_066310.h
+++ b/src/include/game/game_066310.h
@@ -295,17 +295,17 @@ u32 func0f08cb20(void);
 u32 func0f08d3dc(void);
 u32 func0f08d460(void);
 u32 func0f08d4e8(struct doorobj *door);
-u32 func0f08d514(void);
+void func0f08d514(struct doorobj *door);
 u32 func0f08d540(void);
 u32 func0f08d784(void);
 u32 func0f08daa8(void);
 u32 func0f08dd44(void);
-u32 func0f08df10(void);
+void func0f08df10(s8 soundtype, struct prop *prop);
 u32 func0f08e0c4(void);
 u32 func0f08e1a0(void);
-u32 func0f08e214(void);
+u32 decodeXorAaaaaaaa(u32 value);
 u32 func0f08e224(void);
-u32 func0f08e2ac(void);
+void func0f08e2ac(struct doorobj *door);
 u32 func0f08e3a4(void);
 u32 doorActivate(struct defaultobj *obj, u32 arg1);
 u32 func0f08e520(void);
diff --git a/src/include/types.h b/src/include/types.h
index d9c62d30a..877d583f6 100644
--- a/src/include/types.h
+++ b/src/include/types.h
@@ -681,21 +681,23 @@ struct defaultobj {
 
 struct doorobj { // objtype 0x01
 	struct defaultobj base;
-	/*0x5c*/ f32 unk5c;
-	/*0x60*/ u32 unk60;
-	/*0x64*/ u32 unk64;
-	/*0x68*/ u32 unk68;
-	/*0x6c*/ u32 unk6c;
-	/*0x70*/ u32 unk70;
-	/*0x74*/ u32 lockbits;
-	/*0x78*/ u32 unk78;
-	/*0x7c*/ f32 speed;
-	/*0x80*/ f32 unk80;
-	/*0x84*/ s8 state;
-	/*0x88*/ u32 unk88;
-	/*0x8c*/ u32 unk8c;
-	/*0x90*/ u32 unk90;
-	/*0x94*/ u32 unk94;
+	/*0x5c*/ f32 maxfrac;
+	/*0x60*/ u32 perimfrac;
+	/*0x64*/ u32 accel;
+	/*0x68*/ u32 decel;
+	/*0x6c*/ u32 maxspeed;
+	/*0x70*/ u16 doorflags;
+	/*0x72*/ u16 doortype;
+	/*0x74*/ u32 keyflags;
+	/*0x78*/ u32 autoclosetime;
+	/*0x7c*/ f32 frac;
+	/*0x80*/ f32 fracspeed;
+	/*0x84*/ s8 mode;
+	/*0x85*/ u8 glasshits;
+	/*0x86*/ u16 fadealpha;
+	/*0x88*/ u16 xludist;
+	/*0x8a*/ u16 opadist;
+	/*0x8c*/ struct coord startpos;
 	/*0x98*/ u32 unk98;
 	/*0x9c*/ u32 unk9c;
 	/*0xa0*/ u32 unka0;
@@ -705,8 +707,13 @@ struct doorobj { // objtype 0x01
 	/*0xb0*/ u32 unkb0;
 	/*0xb4*/ u32 unkb4;
 	/*0xb8*/ u32 unkb8;
-	/*0xbc*/ u32 unkbc;
-	/*0xc0*/ u32 unkc0;
+	/*0xbc*/ struct doorobj *sibling;
+	/*0xc0*/ u32 lastopen60;
+	/*0xc4*/ s16 portal;
+	/*0xc6*/ s8 soundtype;
+	/*0xc7*/ s8 fadetime60;
+	/*0xc8*/ s32 lastcalc60;
+	/*0xcc*/ u8 laserfade;
 };
 
 struct image {
diff --git a/src/include/ultra64/libultra.h b/src/include/ultra64/libultra.h
index 02543925b..e71cb904a 100644
--- a/src/include/ultra64/libultra.h
+++ b/src/include/ultra64/libultra.h
@@ -12,6 +12,7 @@
 extern u32 osTvType;
 extern u32 osRomBase;
 extern u32 osResetType;
+extern u32 osCicId;
 extern u8 osAppNmiBuffer[64];
 
 #endif /* _LIBULTRA_H */
diff --git a/src/setup/setup_000000.c b/src/setup/setup_000000.c
index feb419afc..bd157f821 100644
--- a/src/setup/setup_000000.c
+++ b/src/setup/setup_000000.c
@@ -14366,7 +14366,7 @@ bool (*g_CommandPointers[])(void) = {
 	/*0x00e5*/ ai00e5,
 	/*0x00e6*/ NULL,
 	/*0x00e7*/ NULL,
-	/*0x00e8*/ aiSetDoorClosed,
+	/*0x00e8*/ aiSetDoorOpen,
 	/*0x00e9*/ ai00e9,
 	/*0x00ea*/ aiIfNumPlayersLessThan,
 	/*0x00eb*/ aiIfChrAmmoQuantityLessThan,