diff --git a/port/fast3d/gfx_pc.cpp b/port/fast3d/gfx_pc.cpp
index dc63d3969..0c98cd4a4 100644
--- a/port/fast3d/gfx_pc.cpp
+++ b/port/fast3d/gfx_pc.cpp
@@ -2398,6 +2398,9 @@ static void gfx_run_dl(Gfx* cmd) {
                 rdp.textures_changed[0] = false;
                 rdp.textures_changed[1] = false;
                 break;
+            case G_SETGRAYSCALE_EXT:
+                rdp.grayscale = cmd->words.w1;
+                break;
             case G_LOADBLOCK:
                 gfx_dp_load_block(C1(24, 3), C0(12, 12), C0(0, 12), C1(12, 12), C1(0, 12));
                 break;
@@ -2426,6 +2429,9 @@ static void gfx_run_dl(Gfx* cmd) {
             case G_SETFILLCOLOR:
                 gfx_dp_set_fill_color(cmd->words.w1);
                 break;
+            case G_SETINTENSITY_EXT:
+                gfx_dp_set_grayscale_color(C1(24, 8), C1(16, 8), C1(8, 8), C1(0, 8));
+                break;
             case G_SETCOMBINE:
                 gfx_dp_set_combine_mode(color_comb(C0(20, 4), C1(28, 4), C0(15, 5), C1(15, 3)),
                                         alpha_comb(C0(12, 3), C1(12, 3), C0(9, 3), C1(9, 3)),
diff --git a/src/game/lv.c b/src/game/lv.c
index a461990b8..8473d1a36 100644
--- a/src/game/lv.c
+++ b/src/game/lv.c
@@ -1185,6 +1185,9 @@ Gfx *lvRender(Gfx *gdl)
 				}
 
 				gdl = viRenderViewportEdges(gdl);
+#ifndef PLATFORM_N64
+				gdl = playerSetVisionMode(gdl);
+#endif
 				gdl = skyRender(gdl);
 				bgTick();
 				lightsTick();
@@ -1306,6 +1309,7 @@ Gfx *lvRender(Gfx *gdl)
 				}
 
 				propsTestForPickup();
+
 				gdl = bgRender(gdl);
 				chr0f028498(var80075d68 == 15 || g_AnimHostEnabled);
 				gdl = propsRenderBeams(gdl);
diff --git a/src/game/player.c b/src/game/player.c
index 8f4bec54d..202863f25 100644
--- a/src/game/player.c
+++ b/src/game/player.c
@@ -4484,6 +4484,28 @@ Gfx *playerRenderShield(Gfx *gdl)
 	return gdl;
 }
 
+#ifndef PLATFORM_N64
+Gfx *playerSetVisionMode(Gfx *gdl)
+{
+	if (g_Vars.currentplayer) {
+		if (g_Vars.currentplayer->isdead == false
+				&& g_InCutscene == 0
+				&& (!g_Vars.currentplayer->eyespy || (g_Vars.currentplayer->eyespy && !g_Vars.currentplayer->eyespy->active))
+				&& ((g_Vars.currentplayer->devicesactive & ~g_Vars.currentplayer->devicesinhibit) & DEVICE_NIGHTVISION)) {
+				gDPGrayscaleEXT(gdl++, G_ON);
+				gDPSetGrayscaleColorEXT(gdl++, 0x00, 0xFF, 0x00, 0xFF);
+		} else if (g_Vars.currentplayer->isdead == false
+				&& g_InCutscene == 0
+				&& (!g_Vars.currentplayer->eyespy || (g_Vars.currentplayer->eyespy && !g_Vars.currentplayer->eyespy->active))
+				&& ((g_Vars.currentplayer->devicesactive & ~g_Vars.currentplayer->devicesinhibit) & DEVICE_IRSCANNER)) {
+				gDPGrayscaleEXT(gdl++, G_ON);
+				gDPSetGrayscaleColorEXT(gdl++, 0xFF, 0x00, 0x00, 0xFF);
+		}
+	}
+	return gdl;
+}
+#endif
+
 Gfx *playerRenderHud(Gfx *gdl)
 {
 	if (g_Vars.currentplayer->cameramode == CAMERAMODE_THIRDPERSON) {
@@ -4547,12 +4569,20 @@ Gfx *playerRenderHud(Gfx *gdl)
 				&& ((g_Vars.currentplayer->devicesactive & ~g_Vars.currentplayer->devicesinhibit) & DEVICE_NIGHTVISION)) {
 			gdl = bviewDrawNvLens(gdl);
 			gdl = bviewDrawNvBinoculars(gdl);
+#ifndef PLATFORM_N64
+			// turn off "greenscale"
+			gDPGrayscaleEXT(gdl++, G_OFF);
+#endif
 		} else if (g_Vars.currentplayer->isdead == false
 				&& g_InCutscene == 0
 				&& (!g_Vars.currentplayer->eyespy || (g_Vars.currentplayer->eyespy && !g_Vars.currentplayer->eyespy->active))
 				&& ((g_Vars.currentplayer->devicesactive & ~g_Vars.currentplayer->devicesinhibit) & DEVICE_IRSCANNER)) {
 			gdl = bviewDrawIrLens(gdl);
 			gdl = bviewDrawIrBinoculars(gdl);
+#ifndef PLATFORM_N64
+			// turn off "redscale"
+			gDPGrayscaleEXT(gdl++, G_OFF);
+#endif
 		}
 
 		if (g_Vars.currentplayer->eyesshutfrac > 0) {
diff --git a/src/include/game/player.h b/src/include/game/player.h
index 81840b813..deab58571 100644
--- a/src/include/game/player.h
+++ b/src/include/game/player.h
@@ -106,5 +106,8 @@ void playerSetCamPropertiesWithRoom(struct coord *pos, struct coord *up, struct
 void playerSetCamPropertiesWithoutRoom(struct coord *pos, struct coord *up, struct coord *look, s32 room);
 void playerSetCamProperties(struct coord *pos, struct coord *up, struct coord *look, s32 room);
 void playerClearMemCamRoom(void);
+#ifndef PLATFORM_N64
+Gfx *playerSetVisionMode(Gfx *gdl);
+#endif
 
 #endif
diff --git a/src/include/gbiex.h b/src/include/gbiex.h
index 3916eac67..58e253597 100644
--- a/src/include/gbiex.h
+++ b/src/include/gbiex.h
@@ -185,9 +185,11 @@
 /* Extended RDP commands */
 
 #define G_SETFB_EXT         0x21
-#define G_COPYFB_EXT        0x41
 #define G_SETTIMG_FB_EXT    0x23
 #define G_INVALTEXCACHE_EXT 0x34
+#define G_SETGRAYSCALE_EXT  0x39
+#define G_SETINTENSITY_EXT  0x40
+#define G_COPYFB_EXT        0x41
 
 /* Extended RDP command macros */
 
@@ -214,6 +216,16 @@
     _g->words.w1 = (uintptr_t)(addr);                  \
 }
 
+#define gDPGrayscaleEXT(pkt, state)                    \
+{                                                      \
+    Gfx* _g = (Gfx*)(pkt);                             \
+                                                       \
+    _g->words.w0 = _SHIFTL(G_SETGRAYSCALE_EXT, 24, 8); \
+    _g->words.w1 = state;                              \
+}
+
+#define gDPSetGrayscaleColorEXT(pkt, r, g, b, lerp) DPRGBColor(pkt, G_SETINTENSITY_EXT, r, g, b, lerp)
+
 #endif
 
 #endif