diff --git a/port/src/pdmain.c b/port/src/pdmain.c
index b08870abd..fbab2b0fb 100644
--- a/port/src/pdmain.c
+++ b/port/src/pdmain.c
@@ -465,7 +465,15 @@ void mainLoop(void)
 		}
 
 		if (g_Vars.coopplayernum >= 0 || g_Vars.antiplayernum >= 0) {
+#ifdef PLATFORM_N64
 			g_MpSetup.chrslots = 0x03;
+#else
+			if (g_Vars.antiplayernum < 0) {
+				// Counter-Operative now uses a different approach which allows more than 2 players.
+				// Co-Operative, on the other hand, is currently limited to 2 players.
+				g_MpSetup.chrslots = 0x03;
+			}
+#endif
 			mpReset();
 		} else if (g_Vars.perfectbuddynum) {
 			mpReset();
diff --git a/src/game/bondwalk.c b/src/game/bondwalk.c
index 8bd907e2e..1d0853c06 100644
--- a/src/game/bondwalk.c
+++ b/src/game/bondwalk.c
@@ -475,7 +475,7 @@ bool bwalkCalculateNewPositionWithPush(struct coord *delta, f32 rotateamount, bo
 					}
 				} else if (chr->chrflags & CHRCFLAG_PUSHABLE) {
 					if (g_Vars.antiplayernum < 0
-							|| g_Vars.currentplayer != g_Vars.anti
+							|| PLAYER_IS_NOT_ANTI(g_Vars.currentplayer)
 							|| (chr->hidden & CHRHFLAG_ANTINONINTERACTABLE) == 0) {
 						canpush = true;
 					}
@@ -809,7 +809,7 @@ void bwalkUpdateVertical(void)
 	// Maybe reset counter-op's radius - not sure why
 	// Maybe it gets set to 0 when they die?
 	if (g_Vars.antiplayernum >= 0
-			&& g_Vars.currentplayer == g_Vars.anti
+			&& PLAYER_IS_ANTI(g_Vars.currentplayer)
 			&& g_Vars.currentplayer->bond2.radius != 30
 			&& cdTestVolume(&g_Vars.currentplayer->prop->pos, 30, g_Vars.currentplayer->prop->rooms, CDTYPE_ALL, CHECKVERTICAL_YES, ymax - g_Vars.currentplayer->prop->pos.y, ymin - g_Vars.currentplayer->prop->pos.y)) {
 		g_Vars.currentplayer->prop->chr->radius = 30;
diff --git a/src/game/chr.c b/src/game/chr.c
index 08817916a..8d6e20f9e 100644
--- a/src/game/chr.c
+++ b/src/game/chr.c
@@ -4662,7 +4662,7 @@ void chrHit(struct shotdata *shotdata, struct hit *hit)
 				hit->model, hit->hitthing.unk28 / 2, sp90);
 
 		if (g_Vars.antiplayernum >= 0
-				&& g_Vars.currentplayer == g_Vars.anti
+				&& PLAYER_IS_ANTI(g_Vars.currentplayer)
 				&& (chr->hidden & CHRHFLAG_ANTINONINTERACTABLE)) {
 			return;
 		}
diff --git a/src/game/chraction.c b/src/game/chraction.c
index 4bf5ccb64..2b5bc41cb 100644
--- a/src/game/chraction.c
+++ b/src/game/chraction.c
@@ -4351,7 +4351,7 @@ void chrDamage(struct chrdata *chr, f32 damage, struct coord *vector, struct gse
 	// Don't damage if attacker was anti and chr is non-interactable by anti
 	if (g_Vars.antiplayernum >= 0
 			&& aprop
-			&& aprop == g_Vars.anti->prop
+			&& PROP_IS_FOR_ANTI_PLAYER(aprop)
 			&& (chr->hidden & CHRHFLAG_ANTINONINTERACTABLE)) {
 		return;
 	}
@@ -4490,7 +4490,9 @@ void chrDamage(struct chrdata *chr, f32 damage, struct coord *vector, struct gse
 		}
 
 		// Anti shooting other enemies is lethal
-		if (aprop && aprop == g_Vars.anti->prop && vprop != g_Vars.bond->prop) {
+		if (aprop
+				&& PROP_IS_FOR_ANTI_PLAYER(aprop)
+				&& vprop != g_Vars.bond->prop) {
 			damage *= 100;
 		}
 	} else {
@@ -8321,7 +8323,7 @@ void chrAlertOthersOfInjury(struct chrdata *chr, bool dying)
 	s32 numinrange = 0;
 	s32 numchrs = chrsGetNumSlots();
 
-	if (g_Vars.antiplayernum >= 0 && chr->prop == g_Vars.anti->prop) {
+	if (g_Vars.antiplayernum >= 0 && PROP_IS_FOR_ANTI_PLAYER(chr->prop)) {
 		return;
 	}
 
@@ -13556,7 +13558,7 @@ void chraTickBg(void)
 
 				if (targetprop && (targetprop->type == PROPTYPE_CHR || targetprop->type == PROPTYPE_PLAYER)) {
 					if ((targetprop->type == PROPTYPE_PLAYER
-								&& !(g_Vars.antiplayernum >= 0 && g_Vars.anti && g_Vars.anti->prop == targetprop)
+								&& !(g_Vars.antiplayernum >= 0 && g_Vars.anti && PROP_IS_FOR_ANTI_PLAYER(targetprop))
 								&& chrCompareTeams(chr, targetprop->chr, COMPARE_ENEMIES))
 							|| CHRRACE(targetprop->chr) == RACE_EYESPY) {
 						s32 time60;
diff --git a/src/game/chraicommands.c b/src/game/chraicommands.c
index 9a5517348..85f89f83c 100644
--- a/src/game/chraicommands.c
+++ b/src/game/chraicommands.c
@@ -52,6 +52,10 @@
 #include "data.h"
 #include "types.h"
 
+#ifndef PLATFORM_N64
+#include "game/mplayer/mplayer.h"
+#endif
+
 /**
  * @cmd 0000
  */
@@ -6035,11 +6039,35 @@ bool aiSetChrPresetToChrNearPad(void)
 bool aiChrSetTeam(void)
 {
 	u8 *cmd = g_Vars.ailist + g_Vars.aioffset;
+#ifdef PLATFORM_N64
 	struct chrdata *chr = chrFindById(g_Vars.chrdata, cmd[2]);
 
 	if (chr) {
 		chr->team = cmd[3];
 	}
+#else
+	u32 playernum;
+	if (cmd[2] == CHR_ANTI && g_Vars.antiplayernum >= 0) {
+		// There can be multiple counter-op players, so set this for all.
+		for (playernum = 0; playernum < PLAYERCOUNT(); playernum++) {
+			struct player *player = g_Vars.players[playernum];
+
+			if (player && PLAYER_IS_ANTI(player)) {
+				struct chrdata *chr = player->prop->chr;
+
+				if (chr) {
+					chr->team = cmd[3];
+				}
+			}
+		}
+	} else {
+		struct chrdata *chr = chrFindById(g_Vars.chrdata, cmd[2]);
+
+		if (chr) {
+			chr->team = cmd[3];
+		}
+	}
+#endif
 
 	g_Vars.aioffset += 4;
 
diff --git a/src/game/endscreen.c b/src/game/endscreen.c
index add6d4949..6c18cf072 100644
--- a/src/game/endscreen.c
+++ b/src/game/endscreen.c
@@ -292,6 +292,27 @@ char *endscreenMenuTextAccuracy(struct menuitem *item)
 	return g_StringPointer;
 }
 
+#if MAX_COOPCHRS > 2
+static bool enscreenAnyAntiAborted(void) {
+	size_t num;
+
+	if (g_Vars.antiplayernum < 0) {
+		return false;
+	}
+
+	for (num = 0; num < PLAYERCOUNT(); num++) {
+		if (PLAYERNUM_IS_ANTI(num) && g_Vars.players[num] && g_Vars.players[num]->aborted) {
+			return true;
+		}
+	}
+
+	return false;
+}
+#define ANTI_ABORTED() (enscreenAnyAntiAborted())
+#else
+#define ANTI_ABORTED() (g_Vars.anti->aborted)
+#endif
+
 char *endscreenMenuTextMissionStatus(struct menuitem *item)
 {
 	if (g_CheatsActiveBank0 || g_CheatsActiveBank1) {
@@ -312,7 +333,7 @@ char *endscreenMenuTextMissionStatus(struct menuitem *item)
 				return langGet(L_OPTIONS_295); // "Aborted"
 			}
 
-			if (g_Vars.anti->aborted) {
+			if (ANTI_ABORTED()) {
 				return langGet(L_OPTIONS_295); // "Aborted"
 			}
 
@@ -320,7 +341,7 @@ char *endscreenMenuTextMissionStatus(struct menuitem *item)
 				return langGet(L_OPTIONS_293); // "Failed"
 			}
 		} else {
-			if (g_Vars.anti->aborted) {
+			if (ANTI_ABORTED()) {
 				return langGet(L_OPTIONS_295); // "Aborted"
 			}
 
@@ -1700,14 +1721,22 @@ void endscreenPushCoop(void)
 #endif
 	{
 		// Failed or aborted
-		if (optionsGetScreenSplit() == SCREENSPLIT_VERTICAL) {
+		if (optionsGetScreenSplit() == SCREENSPLIT_VERTICAL
+#ifndef PLATFORM_N64
+			|| LOCALPLAYERCOUNT() >= 3
+#endif
+		) {
 			menuPushRootDialog(&g_2PMissionEndscreenFailedVMenuDialog, MENUROOT_MPENDSCREEN);
 		} else {
 			menuPushRootDialog(&g_2PMissionEndscreenFailedHMenuDialog, MENUROOT_MPENDSCREEN);
 		}
 	} else {
 		// Completed
-		if (optionsGetScreenSplit() == SCREENSPLIT_VERTICAL) {
+		if (optionsGetScreenSplit() == SCREENSPLIT_VERTICAL
+#ifndef PLATFORM_N64
+			|| LOCALPLAYERCOUNT() >= 3
+#endif
+		) {
 			menuPushRootDialog(&g_2PMissionEndscreenCompletedVMenuDialog, MENUROOT_MPENDSCREEN);
 		} else {
 			menuPushRootDialog(&g_2PMissionEndscreenCompletedHMenuDialog, MENUROOT_MPENDSCREEN);
@@ -1787,20 +1816,28 @@ void endscreenPushAnti(void)
 
 	if (g_Vars.currentplayer == g_Vars.bond) {
 #if VERSION >= VERSION_NTSC_1_0 && defined(DEBUG)
-		if (!g_Vars.anti->aborted && (g_Vars.bond->isdead || g_Vars.bond->aborted || !objectiveIsAllComplete()) && !debugIsSetCompleteEnabled())
+		if (!ANTI_ABORTED() && (g_Vars.bond->isdead || g_Vars.bond->aborted || !objectiveIsAllComplete()) && !debugIsSetCompleteEnabled())
 #else
-		if (!g_Vars.anti->aborted && (g_Vars.bond->isdead || g_Vars.bond->aborted || !objectiveIsAllComplete()))
+		if (!ANTI_ABORTED() && (g_Vars.bond->isdead || g_Vars.bond->aborted || !objectiveIsAllComplete()))
 #endif
 		{
 			// Bond - failed or aborted
-			if (optionsGetScreenSplit() == SCREENSPLIT_VERTICAL) {
+			if (optionsGetScreenSplit() == SCREENSPLIT_VERTICAL
+#ifndef PLATFORM_N64
+				|| LOCALPLAYERCOUNT() >= 3
+#endif
+			) {
 				menuPushRootDialog(&g_2PMissionEndscreenFailedVMenuDialog, MENUROOT_MPENDSCREEN);
 			} else {
 				menuPushRootDialog(&g_2PMissionEndscreenFailedHMenuDialog, MENUROOT_MPENDSCREEN);
 			}
 		} else {
 			// Bond - completed
-			if (optionsGetScreenSplit() == SCREENSPLIT_VERTICAL) {
+			if (optionsGetScreenSplit() == SCREENSPLIT_VERTICAL
+#ifndef PLATFORM_N64
+				|| LOCALPLAYERCOUNT() >= 3
+#endif
+			) {
 				menuPushRootDialog(&g_2PMissionEndscreenCompletedVMenuDialog, MENUROOT_MPENDSCREEN);
 			} else {
 				menuPushRootDialog(&g_2PMissionEndscreenCompletedHMenuDialog, MENUROOT_MPENDSCREEN);
@@ -1810,20 +1847,28 @@ void endscreenPushAnti(void)
 		filemgrSaveOrLoad(&g_GameFileGuid, FILEOP_SAVE_GAME_000, 0);
 	} else {
 #if VERSION >= VERSION_NTSC_1_0 && defined(DEBUG)
-		if (!g_Vars.anti->aborted && (g_Vars.bond->isdead || g_Vars.bond->aborted || !objectiveIsAllComplete()) && !debugIsSetCompleteEnabled())
+		if (!ANTI_ABORTED() && (g_Vars.bond->isdead || g_Vars.bond->aborted || !objectiveIsAllComplete()) && !debugIsSetCompleteEnabled())
 #else
-		if (!g_Vars.anti->aborted && (g_Vars.bond->isdead || g_Vars.bond->aborted || !objectiveIsAllComplete()))
+		if (!ANTI_ABORTED() && (g_Vars.bond->isdead || g_Vars.bond->aborted || !objectiveIsAllComplete()))
 #endif
 		{
 			// Anti - completed
-			if (optionsGetScreenSplit() == SCREENSPLIT_VERTICAL) {
+			if (optionsGetScreenSplit() == SCREENSPLIT_VERTICAL
+#ifndef PLATFORM_N64
+				|| LOCALPLAYERCOUNT() >= 3
+#endif
+			) {
 				menuPushRootDialog(&g_2PMissionEndscreenCompletedVMenuDialog, MENUROOT_MPENDSCREEN);
 			} else {
 				menuPushRootDialog(&g_2PMissionEndscreenCompletedHMenuDialog, MENUROOT_MPENDSCREEN);
 			}
 		} else {
 			// Anti - failed or aborted
-			if (optionsGetScreenSplit() == SCREENSPLIT_VERTICAL) {
+			if (optionsGetScreenSplit() == SCREENSPLIT_VERTICAL
+#ifndef PLATFORM_N64
+				|| LOCALPLAYERCOUNT() >= 3
+#endif
+			) {
 				menuPushRootDialog(&g_2PMissionEndscreenFailedVMenuDialog, MENUROOT_MPENDSCREEN);
 			} else {
 				menuPushRootDialog(&g_2PMissionEndscreenFailedHMenuDialog, MENUROOT_MPENDSCREEN);
diff --git a/src/game/explosions.c b/src/game/explosions.c
index c7516f216..72d1877b5 100644
--- a/src/game/explosions.c
+++ b/src/game/explosions.c
@@ -847,7 +847,7 @@ void explosionInflictDamage(struct prop *expprop)
 						minfrac = (minfrac * 0.7f + 0.3f) * type->damage;
 
 						if (g_Vars.antiplayernum >= 0
-								&& g_Vars.antiplayernum == exp->owner
+								&& EXPLOSION_OWNER_IS_ANTI_PLAYER(exp->owner)
 								&& (obj->flags2 & OBJFLAG2_IMMUNETOANTI)) {
 							// anti cannot damage this obj
 						} else if (isfirstframe) {
@@ -997,8 +997,16 @@ void explosionInflictDamage(struct prop *expprop)
 						ownerprop = g_Vars.bond->prop;
 					} else if (g_Vars.coopplayernum >= 0 && exp->owner == g_Vars.coopplayernum) {
 						ownerprop = g_Vars.coop->prop;
-					} else if (g_Vars.antiplayernum >= 0 && exp->owner == g_Vars.antiplayernum) {
+					} else if (g_Vars.antiplayernum >= 0 && EXPLOSION_OWNER_IS_ANTI_PLAYER(exp->owner)) {
+#if PLATFORM_N64
 						ownerprop = g_Vars.anti->prop;
+#else
+						struct chrdata *ownerchr = mpGetChrFromPlayerIndex(exp->owner);
+
+						if (ownerchr) {
+							ownerprop = ownerchr->prop;
+						}
+#endif
 					}
 
 					chrDamageByExplosion(chr, minfrac, &spa0, ownerprop, &expprop->pos);
@@ -1212,8 +1220,12 @@ u32 explosionTick(struct prop *prop)
 
 			if (g_Vars.normmplayerisrunning) {
 				chr = mpGetChrFromPlayerIndex(exp->owner);
-			} else if (g_Vars.antiplayernum >= 0 && exp->owner == g_Vars.antiplayernum) {
+			} else if (g_Vars.antiplayernum >= 0 && EXPLOSION_OWNER_IS_ANTI_PLAYER(exp->owner)) {
+#if PLATFORM_N64
 				chr = g_Vars.anti->prop->chr;
+#else
+				chr = mpGetChrFromPlayerIndex(exp->owner);
+#endif
 			} else if (g_Vars.coopplayernum >= 0 && exp->owner == g_Vars.coopplayernum) {
 				chr = g_Vars.coop->prop->chr;
 			} else {
diff --git a/src/game/mainmenu.c b/src/game/mainmenu.c
index 1e84f2daf..be898224d 100644
--- a/src/game/mainmenu.c
+++ b/src/game/mainmenu.c
@@ -748,6 +748,7 @@ MenuItemHandlerResult menuhandlerAcceptMission(s32 operation, struct menuitem *i
 				setNumPlayers(1);
 			}
 		} else if (g_MissionConfig.isanti) {
+#ifdef PLATFORM_N64
 			if (g_Vars.pendingantiplayernum == 1) {
 				g_Vars.bondplayernum = 0;
 				g_Vars.antiplayernum = 1;
@@ -757,7 +758,27 @@ MenuItemHandlerResult menuhandlerAcceptMission(s32 operation, struct menuitem *i
 			}
 
 			g_Vars.coopplayernum = -1;
+
 			setNumPlayers(2);
+#else
+			u32 contmask = joyGetConnectedControllers();
+			u32 plrcount = 0;
+			u32 tmpmask;
+
+			// Count all players
+			tmpmask = contmask;
+			while (tmpmask) {
+				plrcount += (tmpmask & 0x1);
+				tmpmask >>= 1;
+			}
+
+			g_Vars.bondplayernum = g_Vars.pendingantiplayernum ^ 1;
+			g_Vars.antiplayernum = (g_Vars.bondplayernum == 0 ? 1 : 0);
+			g_Vars.coopplayernum = -1;
+
+			setNumPlayers(plrcount);
+			g_MpSetup.chrslots = contmask;
+#endif
 		} else {
 			// Solo
 			g_Vars.bondplayernum = 0;
@@ -1545,6 +1566,8 @@ MenuItemHandlerResult menuhandlerAntiRadar(s32 operation, struct menuitem *item,
 	return 0;
 }
 
+#ifdef PLATFORM_N64
+
 MenuItemHandlerResult menuhandlerAntiPlayer(s32 operation, struct menuitem *item, union handlerdata *data)
 {
 	const u16 labels[] = {L_OPTIONS_271, L_OPTIONS_272};
@@ -1611,6 +1634,100 @@ struct menuitem g_AntiOptionsMenuItems[] = {
 	{ MENUITEMTYPE_END },
 };
 
+#else
+
+MenuItemHandlerResult menuhandlerAntiMainPlayer(s32 operation, struct menuitem *item, union handlerdata *data)
+{
+	static const char *labels[] = {
+		"Player 1",
+		"Player 2",
+		"Player 3",
+		"Player 4",
+	};
+
+	// For consistency with the main save format,
+	// the main player is (pendingantiplayernum XOR 1)
+
+	// g_Vars.(bond|anti|coop)playernum is based on the n'th player slot, not the n'th controller;
+	// that is, it's not based on g_MpSetup.chrslots.
+	// Because of this, it's easier just to change the label.
+
+	u32 tmpmask = joyGetConnectedControllers();
+	u32 plrcount = 0;
+	u32 labelidx = 0;
+	while (tmpmask) {
+		plrcount += (tmpmask & 0x1);
+		if (plrcount <= data->dropdown.value) {
+			labelidx += 1;
+		}
+		tmpmask >>= 1;
+	}
+
+	switch (operation) {
+	case MENUOP_GETOPTIONCOUNT:
+		data->dropdown.value = plrcount;
+		break;
+	case MENUOP_GETOPTIONTEXT:
+		return (s32) (labels[labelidx]);
+	case MENUOP_SET:
+		g_Vars.pendingantiplayernum = data->dropdown.value ^ 1;
+		g_Vars.modifiedfiles |= MODFILE_GAME;
+		break;
+	case MENUOP_GETSELECTEDINDEX:
+		data->dropdown.value = g_Vars.pendingantiplayernum ^ 1;
+		break;
+	}
+
+	return 0;
+}
+
+struct menuitem g_AntiOptionsMenuItems[] = {
+	{
+		MENUITEMTYPE_CHECKBOX,
+		0,
+		0,
+		L_OPTIONS_267, // "Radar On"
+		0,
+		menuhandlerAntiRadar,
+	},
+	{
+		MENUITEMTYPE_DROPDOWN,
+		0,
+		MENUITEMFLAG_LITERAL_TEXT,
+		(uintptr_t)"Main Player",
+		0,
+		menuhandlerAntiMainPlayer,
+	},
+	{
+		MENUITEMTYPE_SEPARATOR,
+		0,
+		0,
+		0,
+		0,
+		NULL,
+	},
+	{
+		MENUITEMTYPE_SELECTABLE,
+		0,
+		0,
+		L_OPTIONS_269, // "Continue"
+		0,
+		menuhandlerBuddyOptionsContinue,
+	},
+	{
+		MENUITEMTYPE_SELECTABLE,
+		0,
+		MENUITEMFLAG_SELECTABLE_CLOSESDIALOG,
+		L_OPTIONS_270, // "Cancel"
+		0,
+		NULL,
+	},
+	{ MENUITEMTYPE_END },
+};
+
+#endif
+
+
 struct menudialogdef g_AntiOptionsMenuDialog = {
 	MENUDIALOGTYPE_DEFAULT,
 	L_OPTIONS_266, // "Counter-Operative Options"
@@ -4854,7 +4971,7 @@ MenuItemHandlerResult menuhandlerMainMenuCooperative(s32 operation, struct menui
 MenuItemHandlerResult menuhandlerMainMenuCounterOperative(s32 operation, struct menuitem *item, union handlerdata *data)
 {
 	if (operation == MENUOP_CHECKDISABLED) {
-		if ((joyGetConnectedControllers() & 2) == 0) {
+		if ((joyGetConnectedControllers() & ~0x1) == 0) {
 			return true;
 		}
 	}
diff --git a/src/game/mplayer/ingame.c b/src/game/mplayer/ingame.c
index 390860a46..4286739f0 100644
--- a/src/game/mplayer/ingame.c
+++ b/src/game/mplayer/ingame.c
@@ -800,7 +800,11 @@ void mpPushPauseDialog(void)
 					menuPushRootDialog(&g_MpPausePlayerRankingMenuDialog, MENUROOT_MPPAUSE);
 				}
 			} else {
-				if (optionsGetScreenSplit() == SCREENSPLIT_VERTICAL) {
+				if (optionsGetScreenSplit() == SCREENSPLIT_VERTICAL
+#ifndef PLATFORM_N64
+					|| LOCALPLAYERCOUNT() >= 3
+#endif
+				) {
 					menuPushRootDialog(&g_2PMissionPauseVMenuDialog, MENUROOT_MPPAUSE);
 				} else {
 					menuPushRootDialog(&g_2PMissionPauseHMenuDialog, MENUROOT_MPPAUSE);
diff --git a/src/game/mplayer/mplayer.c b/src/game/mplayer/mplayer.c
index 7f27e0165..9336747fb 100644
--- a/src/game/mplayer/mplayer.c
+++ b/src/game/mplayer/mplayer.c
@@ -256,7 +256,15 @@ void mpReset(void)
 		g_Vars.lvmpbotlevel = true;
 	}
 
-	if (g_Vars.coopplayernum >= 0 || g_Vars.antiplayernum >= 0) {
+#ifdef PLATFORM_N64
+	if (g_Vars.coopplayernum >= 0 || g_Vars.antiplayernum >= 0)
+#else
+	// Counter-Operative now uses a different approach which allows more than 2 players.
+	// Co-Operative, on the other hand, is currently limited to 2 players.
+	// Due to the change in approach, it's better to ignore 2.x controls for Counter-Operative.
+	if (g_Vars.coopplayernum >= 0)
+#endif
+	{
 		struct mpplayerconfig tmp;
 
 		tmp = g_PlayerConfigsArray[MAX_PLAYERS];
@@ -1333,7 +1341,7 @@ Gfx *mpRenderModalText(Gfx *gdl)
 			&& g_Vars.currentplayer->redbloodfinished
 			&& g_Vars.currentplayer->deathanimfinished
 			&& !(g_Vars.coopplayernum >= 0 && ((g_Vars.bond->isdead && g_Vars.coop->isdead) || !g_Vars.currentplayer->coopcanrestart || g_InCutscene))
-			&& !(g_Vars.antiplayernum >= 0 && ((g_Vars.currentplayer != g_Vars.anti || g_InCutscene)))
+			&& !(g_Vars.antiplayernum >= 0 && ((PLAYER_IS_NOT_ANTI(g_Vars.currentplayer) || g_InCutscene)))
 			&& g_NumReasonsToEndMpMatch == 0) {
 		// Render "Press START" text
 		gdl = text0f153628(gdl);
diff --git a/src/game/player.c b/src/game/player.c
index 6c54d5bde..87346e8b9 100644
--- a/src/game/player.c
+++ b/src/game/player.c
@@ -606,7 +606,7 @@ void playerStartNewLife(void)
 		if (cmd);
 		if (cmd);
 
-		if (g_Vars.antiplayernum < 0 || g_Vars.currentplayer != g_Vars.anti) {
+		if (g_Vars.antiplayernum < 0 || PLAYER_IS_NOT_ANTI(g_Vars.currentplayer)) {
 			while (cmd[0] != INTROCMD_END) {
 				switch (cmd[0]) {
 				case INTROCMD_SPAWN:
@@ -980,7 +980,7 @@ void playerSpawn(void)
 	}
 
 	if (g_Vars.mplayerisrunning) {
-		if (g_Vars.antiplayernum >= 0 && g_Vars.currentplayer == g_Vars.anti) {
+		if (g_Vars.antiplayernum >= 0 && PLAYER_IS_ANTI(g_Vars.currentplayer)) {
 			numsqdists = 0;
 			force = false;
 
@@ -1182,7 +1182,7 @@ void playerChooseBodyAndHead(s32 *bodynum, s32 *headnum, s32 *arg2)
 	bool solo;
 
 	if (g_Vars.antiplayernum >= 0
-			&& g_Vars.currentplayer == g_Vars.anti
+			&& PLAYER_IS_ANTI(g_Vars.currentplayer)
 			&& g_Vars.antiheadnum >= 0
 			&& g_Vars.antibodynum >= 0) {
 		*headnum = g_Vars.antiheadnum;
@@ -1514,7 +1514,7 @@ void playerTickChrBody(void)
 
 #if VERSION >= VERSION_NTSC_1_0
 		if (g_Vars.antiplayernum >= 0
-				&& g_Vars.currentplayer == g_Vars.anti
+				&& PLAYER_IS_ANTI(g_Vars.currentplayer)
 				&& g_Vars.currentplayer->vv_eyeheight > 159) {
 			g_Vars.currentplayer->vv_eyeheight = 159;
 		}
@@ -4713,7 +4713,7 @@ Gfx *playerRenderHud(Gfx *gdl)
 							chr->chrflags |= CHRCFLAG_HIDDEN;
 						}
 
-						if (g_Vars.antiplayernum >= 0 && g_Vars.currentplayer == g_Vars.anti) {
+						if (g_Vars.antiplayernum >= 0 && PLAYER_IS_ANTI(g_Vars.currentplayer)) {
 							// Anti
 #ifndef PLATFORM_N64
 							if (g_NetMode == NETMODE_SERVER && g_Vars.currentplayer->isremote) {
diff --git a/src/game/playerreset.c b/src/game/playerreset.c
index 6e941dd9c..6e3e79aa2 100644
--- a/src/game/playerreset.c
+++ b/src/game/playerreset.c
@@ -186,7 +186,8 @@ void playerReset(void)
 				cmd = (struct cmd32 *)((uintptr_t)cmd + 8);
 				break;
 			case INTROCMD_WEAPON:
-				if (cmd->param3 == 0 && g_Vars.currentplayer != g_Vars.anti) {
+				if (cmd->param3 == 0 && PLAYER_IS_NOT_ANTI(g_Vars.currentplayer)) {
+
 					modelmgrLoadProjectileModeldefs(cmd->param1);
 
 					if (cmd->param2 >= 0) {
@@ -213,7 +214,7 @@ void playerReset(void)
 				cmd = (struct cmd32 *)((uintptr_t)cmd + 16);
 				break;
 			case INTROCMD_AMMO:
-				if (cmd->param3 == 0 && g_Vars.currentplayer != g_Vars.anti) {
+				if (cmd->param3 == 0 && PLAYER_IS_NOT_ANTI(g_Vars.currentplayer)) {
 					bgunSetAmmoQuantity(cmd->param1, cmd->param2);
 				}
 				cmd = (struct cmd32 *)((uintptr_t)cmd + 16);
diff --git a/src/game/prop.c b/src/game/prop.c
index a8aab35e0..b84f50214 100644
--- a/src/game/prop.c
+++ b/src/game/prop.c
@@ -2362,7 +2362,8 @@ void propsTestForPickup(void)
 
 	if (g_Vars.currentplayer->bondmovemode != MOVEMODE_CUTSCENE
 			&& !g_PlayerInvincible
-			&& g_Vars.currentplayer != g_Vars.anti) {
+			&& PLAYER_IS_NOT_ANTI(g_Vars.currentplayer)
+			) {
 		roomsCopy(g_Vars.currentplayer->prop->rooms, allrooms);
 
 		for (i = 0; g_Vars.currentplayer->prop->rooms[i] != -1; i++) {
diff --git a/src/game/propobj.c b/src/game/propobj.c
index 598eae641..dbc2540c4 100644
--- a/src/game/propobj.c
+++ b/src/game/propobj.c
@@ -9148,7 +9148,7 @@ void autogunTickShoot(struct prop *autogunprop)
 				// (ie. autogun is a Defense autogun or a thrown laptop)
 				if (g_Vars.normmplayerisrunning
 						|| (targetprop && (targetprop->type == PROPTYPE_CHR))
-						|| (g_Vars.antiplayernum >= 0 && targetprop && targetprop == g_Vars.anti->prop)) {
+						|| (g_Vars.antiplayernum >= 0 && targetprop && PROP_IS_FOR_ANTI_PLAYER(targetprop))) {
 					if (cdExamLos08(&gunpos, gunrooms, &hitpos, CDTYPE_ALL, GEOFLAG_BLOCK_SHOOT) == CDRESULT_COLLISION) {
 #if VERSION >= VERSION_PAL_FINAL
 						cdGetPos(&hitpos, 11480, "prop/propobj.c");
@@ -15942,7 +15942,10 @@ void objHit(struct shotdata *shotdata, struct hit *hit)
 		}
 	}
 
-	if (g_Vars.antiplayernum < 0 || g_Vars.currentplayer != g_Vars.anti || (obj->flags2 & OBJFLAG2_IMMUNETOANTI) == 0) {
+	if (g_Vars.antiplayernum < 0
+			|| PLAYER_IS_NOT_ANTI(g_Vars.currentplayer)
+			|| (obj->flags2 & OBJFLAG2_IMMUNETOANTI) == 0) {
+
 		if (hit->hitthing.texturenum != 10000) {
 			f32 damage = gsetGetDamage(&shotdata->gset);
 
diff --git a/src/include/constants.h b/src/include/constants.h
index 163812868..69880383d 100644
--- a/src/include/constants.h
+++ b/src/include/constants.h
@@ -20,8 +20,13 @@
 #define MAX_CHRWAYPOINTS       6
 #define MAX_EXPLOSIONS         6
 #define MAX_EYESPYDARTS        8
+#ifdef PLATFORM_N64
+#define MAX_COOPCHRS           2
+#else
+#define MAX_COOPCHRS           MAX_PLAYERS
+#endif
 #define MAX_MPCHRS             (MAX_PLAYERS + MAX_BOTS)
-#define MAX_MPPLAYERCONFIGS    (MAX_PLAYERS + 2)
+#define MAX_MPPLAYERCONFIGS    (MAX_PLAYERS + MAX_COOPCHRS)
 #define MAX_OBJECTIVES         10
 #define MAX_LOCAL_PLAYERS      4
 #define MAX_PLAYERS            8
@@ -81,6 +86,20 @@
 #define PLAYERCOUNT()       1
 #endif
 
+#if MAX_COOPCHRS > 2
+#define PLAYER_IS_ANTI(plr) (g_Vars.antiplayernum >= 0 && (plr) != g_Vars.bond)
+#define PLAYER_IS_NOT_ANTI(plr) (g_Vars.antiplayernum < 0 || (plr) == g_Vars.bond)
+#define PLAYERNUM_IS_ANTI(plrnum) (g_Vars.antiplayernum >= 0 && (plrnum) != g_Vars.bondplayernum)
+#define PROP_IS_FOR_ANTI_PLAYER(plrprop) (g_Vars.antiplayernum >= 0 && g_Vars.anti && (plrprop)->type == PROPTYPE_PLAYER && (plrprop) != g_Vars.bond->prop)
+#define EXPLOSION_OWNER_IS_ANTI_PLAYER(expowner) (g_Vars.antiplayernum >= 0 && (expowner) != g_Vars.bondplayernum && mpGetChrFromPlayerIndex((expowner)) != NULL)
+#else
+#define PLAYER_IS_ANTI(plr) ((plr) == g_Vars.anti)
+#define PLAYER_IS_NOT_ANTI(plr) ((plr) != g_Vars.anti)
+//define PLAYERNUM_IS_ANTI(plrnum) ((plrnum) == g_Vars.antiplayernum)
+#define PROP_IS_FOR_ANTI_PLAYER(plrprop) ((plrprop) == g_Vars.anti->prop)
+#define EXPLOSION_OWNER_IS_ANTI_PLAYER(expowner) ((expowner) == g_Vars.antiplayernum)
+#endif
+
 #define VALIDWEAPON()       (g_Vars.currentplayer->gunctrl.weaponnum >= WEAPON_UNARMED && g_Vars.currentplayer->gunctrl.weaponnum <= WEAPON_COMBATBOOST)
 #define FUNCISSEC()         (VALIDWEAPON() && (g_PlayerConfigsArray[g_Vars.currentplayerstats->mpindex].gunfuncs[(g_Vars.currentplayer->gunctrl.weaponnum - 1) >> 3] & (1 << ((g_Vars.currentplayer->gunctrl.weaponnum - 1) & 7))))