diff --git a/.gitignore b/.gitignore
index 2e3de6797..4aaf2032f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -21,3 +21,4 @@ src/assets/*/sequences/*.seq
 src/assets/*/textures/*.bin
 src/generated
 tools/mkrom/mkrom
+/.vs
diff --git a/README.md b/README.md
index 5093ed046..9c5e7de14 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,10 @@ There are minor graphics- and gameplay-related issues, and possibly occasional c
 * 60 FPS support, including fixes for some framerate-related issues;
 * fixes for a couple original bugs and crashes;
 * basic mod support, currently enough to load a few custom levels;
-* slightly expanded memory heap size.
+* slightly expanded memory heap size;
+* experimental uncapped framerate support:
+  * set `Game.TickRateDivisor` to `0` in `pd.ini` to activate;
+  * in practice the game will have issues running faster than ~150 FPS, so use VSync or `Video.FramerateLimit` to cap it.
 
 Currently only 32-bit platforms are supported, namely x86 Windows and Linux.  
 Note that 32-bit binaries will still work on 64-bit versions of those platforms,
diff --git a/port/fast3d/gfx_opengl.cpp b/port/fast3d/gfx_opengl.cpp
index eb92631a7..313155bbb 100644
--- a/port/fast3d/gfx_opengl.cpp
+++ b/port/fast3d/gfx_opengl.cpp
@@ -1161,6 +1161,8 @@ void gfx_opengl_copy_framebuffer(int fb_dst, int fb_src, int left, int top, bool
 
     glBindFramebuffer(GL_FRAMEBUFFER, framebuffers[current_framebuffer].fbo);
 
+    glReadBuffer(GL_BACK);
+
     glEnable(GL_SCISSOR_TEST);
 }
 
diff --git a/port/fast3d/gfx_pc.cpp b/port/fast3d/gfx_pc.cpp
index 7ba7974a3..de208322b 100644
--- a/port/fast3d/gfx_pc.cpp
+++ b/port/fast3d/gfx_pc.cpp
@@ -860,12 +860,17 @@ static void import_texture(int i, int tile, bool importReplacement) {
 
     if (rdp.tex_lod || !loaded_texture.addr) {
         // set up miplevel 0; also acts as a catch-all for when .addr is NULL because my texture loader sucks
+        loaded_texture.addr = rdp.texture_to_load.addr;
         loaded_texture.line_size_bytes = rdp.texture_tile[tile].line_size_bytes;
         loaded_texture.full_image_line_size_bytes = rdp.texture_tile[tile].line_size_bytes;
         loaded_texture.full_size_bytes = loaded_texture.full_image_line_size_bytes * rdp.texture_tile[tile].height;
         loaded_texture.size_bytes = loaded_texture.line_size_bytes * rdp.texture_tile[tile].height;
+        if (siz == G_IM_SIZ_32b) {
+            // HACK: fixup 32-bit LODed texture height
+            loaded_texture.size_bytes <<= 1;
+            loaded_texture.full_size_bytes <<= 1;
+        }
         loaded_texture.orig_size_bytes = loaded_texture.size_bytes;
-        loaded_texture.addr = rdp.texture_to_load.addr;
     }
 
     const RawTexMetadata* metadata = &loaded_texture.raw_tex_metadata;
diff --git a/port/src/main.c b/port/src/main.c
index c104ce5a1..e12e67a3a 100644
--- a/port/src/main.c
+++ b/port/src/main.c
@@ -37,6 +37,8 @@ u8 g_VmShowStats = 0;
 
 s32 g_TickRateDiv = 1;
 
+s32 g_SkipIntro = false;
+
 extern s32 g_StageNum;
 
 s32 bootGetMemSize(void)
@@ -123,7 +125,17 @@ int main(int argc, const char **argv)
 	sysLogPrintf(LOG_NOTE, "rom  file at %p - %p", g_RomFile, g_RomFile + g_RomFileSize);
 
 	g_SndDisabled = sysArgCheck("--no-sound");
+
 	g_StageNum = sysArgGetInt("--boot-stage", STAGE_TITLE);
+
+	if (g_StageNum == STAGE_TITLE && (sysArgCheck("--skip-intro") || g_SkipIntro)) {
+		// shorthand for --boot-stage 0x26
+		g_StageNum = STAGE_CITRAINING;
+	} else if (g_StageNum < 0x01 || g_StageNum > 0x5d) {
+		// stage num out of range
+		g_StageNum = STAGE_TITLE;
+	}
+
 	if (g_StageNum != STAGE_TITLE) {
 		sysLogPrintf(LOG_NOTE, "boot stage set to 0x%02x", g_StageNum);
 	}
@@ -139,6 +151,7 @@ PD_CONSTRUCTOR static void gameConfigInit(void)
 	configRegisterInt("Game.CenterHUD", &g_HudCenter, 0, 1);
 	configRegisterFloat("Game.ScreenShakeIntensity", &g_ViShakeIntensityMult, 0.f, 10.f);
 	configRegisterInt("Game.TickRateDivisor", &g_TickRateDiv, 0, 10);
+	configRegisterInt("Game.SkipIntro", &g_SkipIntro, 0, 1);
 	for (s32 j = 0; j < MAX_PLAYERS; ++j) {
 		const s32 i = j + 1;
 		configRegisterFloat(strFmt("Game.Player%d.FovY", i), &g_PlayerExtCfg[j].fovy, 5.f, 175.f);
@@ -148,6 +161,6 @@ PD_CONSTRUCTOR static void gameConfigInit(void)
 		configRegisterFloat(strFmt("Game.Player%d.MouseAimSpeedY", i), &g_PlayerExtCfg[j].mouseaimspeedy, 0.f, 10.f);
 		configRegisterFloat(strFmt("Game.Player%d.RadialMenuSpeed", i), &g_PlayerExtCfg[j].radialmenuspeed, 0.f, 10.f);
 		configRegisterFloat(strFmt("Game.Player%d.CrosshairSway", i), &g_PlayerExtCfg[j].crosshairsway, 0.f, 10.f);
-		configRegisterInt(strFmt("Game.Player%d.ClassicCrouch", i), &g_PlayerExtCfg[j].classiccrouch, 0, 1);
+		configRegisterInt(strFmt("Game.Player%d.CrouchMode", i), &g_PlayerExtCfg[j].crouchmode, 0, CROUCHMODE_TOGGLE_ANALOG);
 	}
 }
diff --git a/port/src/optionsmenu.c b/port/src/optionsmenu.c
index 4e428071c..265eb13cf 100644
--- a/port/src/optionsmenu.c
+++ b/port/src/optionsmenu.c
@@ -7,6 +7,7 @@
 #include "types.h"
 #include "game/mainmenu.h"
 #include "game/menu.h"
+#include "game/gamefile.h"
 #include "video.h"
 #include "input.h"
 #include "config.h"
@@ -723,32 +724,44 @@ struct menudialogdef g_ExtendedVideoMenuDialog = {
 	NULL,
 };
 
-static MenuItemHandlerResult menuhandlerFieldOfView(s32 operation, struct menuitem *item, union handlerdata *data)
+static MenuItemHandlerResult menuhandlerCrouchMode(s32 operation, struct menuitem *item, union handlerdata *data)
 {
+	static const char *opts[] = {
+		"Hold",
+		"Analog",
+		"Toggle",
+		"Toggle + Analog"
+	};
+
 	switch (operation) {
-	case MENUOP_GETSLIDER:
-		data->slider.value = g_PlayerExtCfg[g_ExtMenuPlayer].fovy + 0.5f;
+	case MENUOP_GETOPTIONCOUNT:
+		data->dropdown.value = ARRAYCOUNT(opts);
 		break;
+	case MENUOP_GETOPTIONTEXT:
+		return (intptr_t)opts[data->dropdown.value];
 	case MENUOP_SET:
-		if (data->slider.value >= 15) {
-			g_PlayerExtCfg[g_ExtMenuPlayer].fovy = data->slider.value;
-			if (g_PlayerExtCfg[g_ExtMenuPlayer].fovzoom) {
-				g_PlayerExtCfg[g_ExtMenuPlayer].fovzoommult = g_PlayerExtCfg[g_ExtMenuPlayer].fovy / 60.f;
-			}
-		}
+		g_PlayerExtCfg[g_ExtMenuPlayer].crouchmode = data->dropdown.value;
 		break;
+	case MENUOP_GETSELECTEDINDEX:
+		data->dropdown.value = g_PlayerExtCfg[g_ExtMenuPlayer].crouchmode;
 	}
 
 	return 0;
 }
 
-static MenuItemHandlerResult menuhandlerClassicCrouch(s32 operation, struct menuitem *item, union handlerdata *data)
+static MenuItemHandlerResult menuhandlerFieldOfView(s32 operation, struct menuitem *item, union handlerdata *data)
 {
 	switch (operation) {
-	case MENUOP_GET:
-		return g_PlayerExtCfg[g_ExtMenuPlayer].classiccrouch;
+	case MENUOP_GETSLIDER:
+		data->slider.value = g_PlayerExtCfg[g_ExtMenuPlayer].fovy + 0.5f;
+		break;
 	case MENUOP_SET:
-		g_PlayerExtCfg[g_ExtMenuPlayer].classiccrouch = data->checkbox.value;
+		if (data->slider.value >= 15) {
+			g_PlayerExtCfg[g_ExtMenuPlayer].fovy = data->slider.value;
+			if (g_PlayerExtCfg[g_ExtMenuPlayer].fovzoom) {
+				g_PlayerExtCfg[g_ExtMenuPlayer].fovzoommult = g_PlayerExtCfg[g_ExtMenuPlayer].fovy / 60.f;
+			}
+		}
 		break;
 	}
 
@@ -771,12 +784,12 @@ static MenuItemHandlerResult menuhandlerCrosshairSway(s32 operation, struct menu
 
 struct menuitem g_ExtendedGameMenuItems[] = {
 	{
-		MENUITEMTYPE_CHECKBOX,
+		MENUITEMTYPE_DROPDOWN,
 		0,
 		MENUITEMFLAG_LITERAL_TEXT,
-		(uintptr_t)"Allow Classic Crouch",
+		(uintptr_t)"Crouch Mode",
 		0,
-		menuhandlerClassicCrouch,
+		menuhandlerCrouchMode,
 	},
 	{
 		MENUITEMTYPE_SLIDER,
diff --git a/src/game/bondmove.c b/src/game/bondmove.c
index 45f75ea6c..5e44e837a 100644
--- a/src/game/bondmove.c
+++ b/src/game/bondmove.c
@@ -1565,31 +1565,43 @@ void bmoveProcessInput(bool allowc1x, bool allowc1y, bool allowc1buttons, bool i
 
 						// Handle xbla-style crouch cycling
 						for (i = 0; i < numsamples; i++) {
-							s32 crouchsample = joyGetButtonsPressedOnSample(i, contpad1, 0xffffffff) & BUTTON_CROUCH_CYCLE;
-							if (crouchsample) {
-								if (g_Vars.currentplayer->crouchpos <= 0) {
-									g_Vars.currentplayer->crouchpos = CROUCHPOS_STAND;
-								} else {
-									g_Vars.currentplayer->crouchpos--;
-								}
-							}
-
 							// handle 1964GEPD style crouch setting
-							crouchsample = joyGetButtonsPressedOnSample(i, contpad1, c1allowedbuttons) & BUTTON_HALF_CROUCH;
-							if (crouchsample) {
-								if (g_Vars.currentplayer->crouchpos == CROUCHPOS_DUCK) {
-									g_Vars.currentplayer->crouchpos = CROUCHPOS_STAND;
-								} else {
-									g_Vars.currentplayer->crouchpos = CROUCHPOS_DUCK;
+							s32 crouchsample;
+							if (PLAYER_EXTCFG().crouchmode & CROUCHMODE_TOGGLE) {
+								// press to toggle crouch position
+								crouchsample = joyGetButtonsPressedOnSample(i, contpad1, 0xffffffff) & BUTTON_CROUCH_CYCLE;
+								if (crouchsample) {
+									if (g_Vars.currentplayer->crouchpos <= 0) {
+										g_Vars.currentplayer->crouchpos = CROUCHPOS_STAND;
+									} else {
+										g_Vars.currentplayer->crouchpos--;
+									}
 								}
-							}
-
-							crouchsample = joyGetButtonsPressedOnSample(i, contpad1, c1allowedbuttons) & BUTTON_FULL_CROUCH;
-							if (crouchsample) {
-								if (g_Vars.currentplayer->crouchpos == CROUCHPOS_SQUAT) {
+								crouchsample = joyGetButtonsPressedOnSample(i, contpad1, c1allowedbuttons) & BUTTON_HALF_CROUCH;
+								if (crouchsample) {
+									if (g_Vars.currentplayer->crouchpos == CROUCHPOS_DUCK) {
+										g_Vars.currentplayer->crouchpos = CROUCHPOS_STAND;
+									} else {
+										g_Vars.currentplayer->crouchpos = CROUCHPOS_DUCK;
+									}
+								}
+								crouchsample = joyGetButtonsPressedOnSample(i, contpad1, c1allowedbuttons) & BUTTON_FULL_CROUCH;
+								if (crouchsample) {
+									if (g_Vars.currentplayer->crouchpos == CROUCHPOS_SQUAT) {
+										g_Vars.currentplayer->crouchpos = CROUCHPOS_STAND;
+									} else {
+										g_Vars.currentplayer->crouchpos = CROUCHPOS_SQUAT;
+									}
+								}
+							} else if (PLAYER_EXTCFG().crouchmode == CROUCHMODE_HOLD) {
+								// hold to crouch
+								crouchsample = joyGetButtonsOnSample(i, contpad1, c1allowedbuttons) & (BUTTON_FULL_CROUCH | BUTTON_HALF_CROUCH);
+								if (!crouchsample) {
 									g_Vars.currentplayer->crouchpos = CROUCHPOS_STAND;
-								} else {
+								} else if (crouchsample & BUTTON_FULL_CROUCH) {
 									g_Vars.currentplayer->crouchpos = CROUCHPOS_SQUAT;
+								} else if (crouchsample & BUTTON_HALF_CROUCH) {
+									g_Vars.currentplayer->crouchpos = CROUCHPOS_DUCK;
 								}
 							}
 						}
@@ -1657,7 +1669,7 @@ void bmoveProcessInput(bool allowc1x, bool allowc1y, bool allowc1buttons, bool i
 #endif
 
 					// Handle C-button and analog crouch and uncrouch, if enabled
-					if (PLAYER_EXTCFG().classiccrouch && allowc1buttons) {
+					if ((PLAYER_EXTCFG().crouchmode & CROUCHMODE_ANALOG) && allowc1buttons) {
 						for (i = 0; i < numsamples; i++) {
 							if (!canmanualzoom && aimonhist[i]) {
 								bool goUp = joyGetButtonsPressedOnSample(i, contpad1, c1allowedbuttons & (U_CBUTTONS));
diff --git a/src/game/cheats.c b/src/game/cheats.c
index bfe910cb0..71ac21ca8 100644
--- a/src/game/cheats.c
+++ b/src/game/cheats.c
@@ -859,6 +859,79 @@ char *cheatGetName(s32 cheat_id)
 }
 #endif
 
+#ifndef PLATFORM_N64
+
+static MenuItemHandlerResult menuhandlerUnlockEverything(s32 operation, struct menuitem *item, union handlerdata *data)
+{
+	if (operation == MENUOP_SET) {
+		gamefileUnlockEverything();
+	}
+	return 0;
+}
+
+struct menuitem g_CheatsConfirmUnlockMenuItems[] = {
+	{
+		MENUITEMTYPE_LABEL,
+		0,
+		MENUITEMFLAG_LITERAL_TEXT,
+		(uintptr_t)"Are you sure?\n\nThis will overwrite any progress\nsaved to the current profile.\n",
+		0,
+		NULL,
+	},
+	{
+		MENUITEMTYPE_SEPARATOR,
+		0,
+		0,
+		0x00000082,
+		0,
+		NULL,
+	},
+	{
+		MENUITEMTYPE_MARQUEE,
+		0,
+		MENUITEMFLAG_SMALLFONT | MENUITEMFLAG_MARQUEE_FADEBOTHSIDES | MENUITEMFLAG_LITERAL_TEXT,
+		(uintptr_t)"Unlocks all cheats, weapons, missions, challenges and combat simulator items.\n",
+		0,
+		NULL,
+	},
+	{
+		MENUITEMTYPE_SEPARATOR,
+		0,
+		0,
+		0x00000082,
+		0,
+		NULL,
+	},
+	{
+		MENUITEMTYPE_SELECTABLE,
+		0,
+		MENUITEMFLAG_SELECTABLE_CENTRE | MENUITEMFLAG_SELECTABLE_CLOSESDIALOG,
+		L_OPTIONS_191, // "No"
+		0,
+		NULL,
+	},
+	{
+		MENUITEMTYPE_SELECTABLE,
+		0,
+		MENUITEMFLAG_SELECTABLE_CENTRE | MENUITEMFLAG_SELECTABLE_CLOSESDIALOG,
+		L_OPTIONS_190, // "Yes"
+		0,
+		menuhandlerUnlockEverything,
+	},
+	{ MENUITEMTYPE_END },
+};
+
+struct menudialogdef g_CheatsConfirmUnlockMenuDialog = {
+	MENUDIALOGTYPE_DANGER,
+	L_OPTIONS_188, // "Warning"
+	g_CheatsConfirmUnlockMenuItems,
+	NULL,
+	0,
+	NULL,
+};
+
+#endif
+
 struct menuitem g_CheatsFunMenuItems[] = {
 	{
 		MENUITEMTYPE_CHECKBOX,
@@ -1538,6 +1611,16 @@ struct menuitem g_CheatsMenuItems[] = {
 		0,
 		cheatMenuHandleTurnOffAllCheats,
 	},
+#ifndef PLATFORM_N64
+	{
+		MENUITEMTYPE_SELECTABLE,
+		0,
+		MENUITEMFLAG_LITERAL_TEXT | MENUITEMFLAG_SELECTABLE_OPENSDIALOG,
+		(uintptr_t)"Unlock Everything\n",
+		0,
+		(void *)&g_CheatsConfirmUnlockMenuDialog,
+	},
+#endif
 	{
 		MENUITEMTYPE_SEPARATOR,
 		0,
diff --git a/src/game/gamefile.c b/src/game/gamefile.c
index d8d36474e..468ac0889 100644
--- a/src/game/gamefile.c
+++ b/src/game/gamefile.c
@@ -567,3 +567,59 @@ void gamefileGetOverview(char *arg0, char *name, u8 *stage, u8 *difficulty, u32
 
 	*difficulty = savebufferReadBits(&buffer, 2);
 }
+
+#ifndef PLATFORM_N64
+
+// Unlock all of the unlockables.
+// These hacks are taken from the original debug mode.
+void gamefileUnlockEverything(void)
+{
+	s32 i, j;
+
+	// unlock all challenges
+	for (i = 0; i < ARRAYCOUNT(g_MpChallenges); ++i) {
+		for (j = 0; j < MAX_PLAYERS; ++j) {
+			g_MpChallenges[i].completions[j] = 0x0f;
+		}
+	}
+	challengeDetermineUnlockedFeatures();
+
+	// complete all missions in coop
+	for (i = 0; i < ARRAYCOUNT(g_GameFile.coopcompletions); ++i) {
+		g_GameFile.coopcompletions[i] = 0x1fffff;
+	}
+
+	// unlock all guns
+	for (i = 0; i < ARRAYCOUNT(g_GameFile.weaponsfound); ++i) {
+		g_GameFile.weaponsfound[i] = 0xff;
+	}
+
+	// unlock all campaign levels
+	for (i = 0; i < NUM_SOLOSTAGES; i++) {
+		for (j = 0; j < 3; j++) {
+			g_GameFile.besttimes[i][j] = 7;
+		}
+	}
+
+	// unlock alternate intro sequence
+	g_AltTitleUnlocked = true;
+
+	// unlock all firing range challenges
+	for (i = 0; i < ARRAYCOUNT(g_GameFile.firingrangescores); ++i) {
+		g_GameFile.firingrangescores[i] = 0xff;
+	}
+
+	// unlock all device training
+	gamefileSetFlag(GAMEFILEFLAG_CI_CLOAK_DONE);
+	gamefileSetFlag(GAMEFILEFLAG_CI_DISGUISE_DONE);
+	gamefileSetFlag(GAMEFILEFLAG_CI_XRAY_DONE);
+	gamefileSetFlag(GAMEFILEFLAG_CI_IR_DONE);
+	gamefileSetFlag(GAMEFILEFLAG_CI_RTRACKER_DONE);
+	gamefileSetFlag(GAMEFILEFLAG_CI_DOORDECODER_DONE);
+	gamefileSetFlag(GAMEFILEFLAG_CI_NIGHTVISION_DONE);
+	gamefileSetFlag(GAMEFILEFLAG_CI_CAMSPY_DONE);
+	gamefileSetFlag(GAMEFILEFLAG_CI_ECMMINE_DONE);
+	gamefileSetFlag(GAMEFILEFLAG_CI_UPLINK_DONE);
+}
+
+#endif
diff --git a/src/game/mplayer/mplayer.c b/src/game/mplayer/mplayer.c
index b389e6215..3faa30032 100644
--- a/src/game/mplayer/mplayer.c
+++ b/src/game/mplayer/mplayer.c
@@ -120,7 +120,7 @@ struct mpweapon g_MpWeapons[NUM_MPWEAPONS] = {
 	.mouseaimspeedy = 0.7f, \
 	.radialmenuspeed = 4.f, \
 	.crosshairsway = 1.f, \
-	.classiccrouch = true, \
+	.crouchmode = CROUCHMODE_TOGGLE_ANALOG, \
 }
 
 struct extplayerconfig g_PlayerExtCfg[MAX_PLAYERS] = { 
diff --git a/src/include/constants.h b/src/include/constants.h
index 2668eee0a..b4d977863 100644
--- a/src/include/constants.h
+++ b/src/include/constants.h
@@ -4702,6 +4702,11 @@ enum weaponnum {
 #define MOUSEAIM_CLASSIC 0 // crosshair moves around the screen in aim mode
 #define MOUSEAIM_LOCKED 1  // crosshair locked to the center of the screen in aim mode
 
+#define CROUCHMODE_HOLD 0   // hold the crouch buttons to keep crouching
+#define CROUCHMODE_ANALOG 1 // analog crouch like on n64
+#define CROUCHMODE_TOGGLE 2 // press the crouch buttons to toggle stance
+#define CROUCHMODE_TOGGLE_ANALOG (CROUCHMODE_ANALOG | CROUCHMODE_TOGGLE)
+
 #endif
 
 #endif
diff --git a/src/include/game/gamefile.h b/src/include/game/gamefile.h
index 62fa97830..e3f8c6431 100644
--- a/src/include/game/gamefile.h
+++ b/src/include/game/gamefile.h
@@ -13,5 +13,6 @@ void gamefileLoadDefaults(struct gamefile *file);
 s32 gamefileLoad(s32 device);
 s32 gamefileSave(s32 device, s32 filenum, u16 deviceserial);
 void gamefileGetOverview(char *arg0, char *name, u8 *stage, u8 *difficulty, u32 *time);
+void gamefileUnlockEverything(void);
 
 #endif
diff --git a/src/include/types.h b/src/include/types.h
index 171b0eda7..f307b8ada 100644
--- a/src/include/types.h
+++ b/src/include/types.h
@@ -6132,7 +6132,7 @@ struct extplayerconfig {
 	s32 mouseaimmode;
 	f32 mouseaimspeedx;
 	f32 mouseaimspeedy;
-	s32 classiccrouch;
+	s32 crouchmode;
 	f32 radialmenuspeed;
 	f32 crosshairsway;
 };