diff --git a/app_debug.c b/app_debug.c
index d8683ae..0605011 100644
--- a/app_debug.c
+++ b/app_debug.c
@@ -46,7 +46,7 @@ void app_DebugText(App *app, vector_Vector *vec_string) {
 	PUSH_STRING(buf);
 	snprintf(
 		buf, sizeof(buf) - 1,
-		"Particle count: %d\n", tree_Count(app->particle->parts));
+		"Particle count[0]: %d\n", tree_Count(app->particle->parts[0]));
 	PUSH_STRING(buf);
 
 	char zero = '\0';
diff --git a/mapper_misc.c b/mapper_misc.c
index 0d11a4c..c9eab97 100644
--- a/mapper_misc.c
+++ b/mapper_misc.c
@@ -6,6 +6,7 @@
 #include "player.h"
 #include "types.h"
 #include "util/assert.h"
+#include "util/rand.h"
 #include <stdio.h>
 
 
@@ -52,6 +53,40 @@ void misc_thinker_Hazard(App *app, Entity *e, Duration deltaTime) {
 		e->thinker = NULL;
 		return;
 	}
+
+	// Emit some black particles
+	// BTW, very bad (but reliable) way to store a number here!
+	static const FillMode mode = {
+		.rop2     = 13, // R2_COPYPEN
+		.style    = 0,  // BS_SOLID
+		.hatch    = 0,
+		.rotate   = {.microseconds = 0},
+		.dissolve = {.microseconds = 0},
+		.fadein   = false,
+		.bg       = 0xffffff,
+		.fg       = 0};
+	uint64_t  emitCooldown = 400.0 * 40000.0 / e->misc->trigger.size.x; // 40 msec across 400px
+	TimePoint lastEmit     = {.microseconds = (uint64_t)e->thinkerData};
+	if (time_Since(lastEmit).microseconds > emitCooldown) {
+		lastEmit = time_Now();
+		lastEmit.microseconds -= 10000 * rand_Double01();
+		Box2 worldbox = ABSOLUTE_BOX(e, e->misc->trigger);
+		particle_Emit(
+			app->particle,
+			0,
+			vec2_Random(
+				worldbox.lefttop.x + 20,
+				worldbox.lefttop.x + worldbox.size.x - 20,
+				worldbox.lefttop.y + 20.0,
+				worldbox.lefttop.y + 40.0),
+			vec2(0.0, rand_DoubleRange(-200.0, -280.0)),
+			rand_DoubleRange(1, 1.5),
+			rand_DoubleRange(18, 30),
+			20, duration_FromSeconds(0), &mode);
+		e->thinkerData = (void *)lastEmit.microseconds;
+	}
+
+
 	if (app->player->player == NULL) // No player
 		return;
 	Component_Player *p         = app->player->player;
diff --git a/particle.c b/particle.c
index 14b8415..acbecc1 100644
--- a/particle.c
+++ b/particle.c
@@ -7,28 +7,40 @@
 #include <stdio.h>
 
 
+typedef struct {
+	uint64_t layer;
+	uint64_t id;
+} _particle_DeleteRecord;
+
+static inline void particle_Delete(System_Particle *sys, int layer, uint64_t id) {
+	uint64_t a[2] = {layer, id};
+	vector_Push(sys->deleted_ids, a);
+}
+
 System_Particle *particle_NewSystem(App *super) {
 	System_Particle *sys = zero_malloc(sizeof(System_Particle));
 
 	sys->super       = super;
-	sys->parts       = tree_Create(sizeof(Particle));
-	sys->deleted_ids = vector_Create(sizeof(uintptr_t));
+	sys->deleted_ids = vector_Create(sizeof(_particle_DeleteRecord));
 	sys->maxID       = 0;
+	for (int i = 0; i < PARTICLE_LAYER_COUNT; i++)
+		sys->parts[i] = tree_Create(sizeof(Particle));
 	return sys;
 }
 void particle_DeleteSystem(System_Particle *sys) {
-	tree_Destroy(sys->parts);
+	for (int i = 0; i < PARTICLE_LAYER_COUNT; i++)
+		tree_Destroy(sys->parts[i]);
 	vector_Destroy(sys->deleted_ids);
 	free(sys);
 }
 
 
-static void _particle_AdvancePart(System_Particle *sys, Particle *p, Duration deltaTime) {
+static void _particle_AdvancePart(System_Particle *sys, int layer, Particle *p, Duration deltaTime) {
 	p->size -= p->sizedec * duration_Seconds(deltaTime);
 	if ((p->tolive.microseconds != 0 &&
 		 time_Since(p->addtime).microseconds > p->tolive.microseconds) ||
 		p->size < EPS) { // vanished
-		particle_Delete(sys, p->id);
+		particle_Delete(sys, layer, p->id);
 		return;
 	}
 
@@ -41,33 +53,33 @@ static void _particle_AdvancePart(System_Particle *sys, Particle *p, Duration de
 }
 
 void particle_Advance(System_Particle *sys, Duration deltaTime) {
-	// Clear particles marked as deleted
-	for (int i = 0; i < vector_Size(sys->deleted_ids); i++) {
-		uintptr_t  id = *(uintptr_t *)vector_At(sys->deleted_ids, i);
-		tree_Node *n  = tree_FindNode(sys->parts, id);
-		if (n != NULL)
-			tree_Delete(sys->parts, n);
+	// Delete particles
+	int len = vector_Size(sys->deleted_ids);
+	for (int i = 0; i < len; i++) {
+		_particle_DeleteRecord rec  = *(_particle_DeleteRecord *)vector_At(sys->deleted_ids, i);
+		tree_Node             *node = tree_FindNode(sys->parts[rec.layer], rec.id);
+		if (!node)
+			WARN("particle id %llu in layer %llu not found", rec.id, rec.layer);
 		else
-			fprintf(stderr, "[particle_Delete][WARN] Missing particle ID [%d]\n", id);
+			tree_Delete(sys->parts[rec.layer], node);
 	}
 	vector_Clear(sys->deleted_ids);
 
-	for (tree_Node *i = tree_FirstNode(sys->parts);
-		 i != NULL;
-		 i = tree_Node_Next(i)) {
-		Particle *p = (Particle *)i->data;
-		_particle_AdvancePart(sys, p, deltaTime);
+	for (int layer = 0; layer < PARTICLE_LAYER_COUNT; layer++) {
+		for (tree_Node *i = tree_FirstNode(sys->parts[layer]);
+			 i != NULL;
+			 i = tree_Node_Next(i)) {
+			Particle *p = (Particle *)i->data;
+			_particle_AdvancePart(sys, layer, p, deltaTime);
+		}
 	}
 }
 
-void particle_Delete(System_Particle *sys, uintptr_t id) {
-	vector_Push(sys->deleted_ids, &id);
-}
 
-
-void particle_Emit(System_Particle *sys, Vec2 pos, Vec2 vec, double vec_friction, double size, double sizedec, Duration tolive, const FillMode *fill) {
+void particle_Emit(System_Particle *sys, int layer, Vec2 pos, Vec2 vec, double vec_friction, double size, double sizedec, Duration tolive, const FillMode *fill) {
+	ASSERT(layer >= 0 && layer <= (PARTICLE_LAYER_COUNT - 1));
 	uintptr_t id = ++sys->maxID;
-	Particle *p  = tree_Insert(sys->parts, id, NULL);
+	Particle *p  = tree_Insert(sys->parts[layer], id, NULL);
 	memset(p, 0, sizeof(Particle));
 	p->id           = id;
 	p->addtime      = time_Now();
@@ -83,10 +95,11 @@ void particle_Emit(System_Particle *sys, Vec2 pos, Vec2 vec, double vec_friction
 
 void particle_Clear(System_Particle *sys) {
 	vector_Clear(sys->deleted_ids);
-	// Delete every first node
-	int count = tree_Count(sys->parts);
-	while (count--)
-		tree_Delete(sys->parts, tree_FirstNode(sys->parts));
-
-	ASSERT(tree_Count(sys->parts) == 0);
+	for (int i = 0; i < PARTICLE_LAYER_COUNT; i++) {
+		// Delete every first node
+		int count = tree_Count(sys->parts[i]);
+		while (count--)
+			tree_Delete(sys->parts[i], tree_FirstNode(sys->parts[i]));
+		ASSERT(tree_Count(sys->parts[i]) == 0);
+	}
 }
diff --git a/particle.h b/particle.h
index 9ad2234..917a047 100644
--- a/particle.h
+++ b/particle.h
@@ -11,6 +11,9 @@ extern "C" {
 #endif
 
 
+#define PARTICLE_LAYER_COUNT 4
+
+
 // A particle instance.
 typedef struct {
 	uintptr_t id;            // ID.
@@ -30,7 +33,7 @@ typedef struct _App App;
 // Particle system.
 typedef struct {
 	App           *super;
-	tree_Tree     *parts; // uintptr_t -> struct Particle
+	tree_Tree     *parts[PARTICLE_LAYER_COUNT]; // uintptr_t -> struct Particle
 	vector_Vector *deleted_ids;
 	uintptr_t      maxID;
 } System_Particle;
@@ -43,8 +46,7 @@ void particle_Render(System_Particle *sys);
 
 
 // Emit a particle here.
-void particle_Emit(System_Particle *sys, Vec2 pos, Vec2 vec, double vec_friction, double size, double sizedec, Duration tolive, const FillMode *fill);
-void particle_Delete(System_Particle *sys, uintptr_t id);
+void particle_Emit(System_Particle *sys, int layer, Vec2 pos, Vec2 vec, double vec_friction, double size, double sizedec, Duration tolive, const FillMode *fill);
 
 // Clear all particles.
 void particle_Clear(System_Particle *sys);
diff --git a/particle_render.cpp b/particle_render.cpp
index 9787e4d..fc0c3da 100644
--- a/particle_render.cpp
+++ b/particle_render.cpp
@@ -10,16 +10,14 @@
 extern "C" {
 
 void particle_Render(System_Particle *sys) {
-	ASSERT(sys->super->camera && "particle_Render called without a Camera system");
-	System_Camera *cam = sys->super->camera;
+	for (int l = 0; l < PARTICLE_LAYER_COUNT; l++)
+		for (tree_Node *i = tree_FirstNode(sys->parts[l]);
+			 i != NULL;
+			 i = tree_Node_Next(i)) {
+			Particle *p = (Particle *)i->data;
 
-	for (tree_Node *i = tree_FirstNode(sys->parts);
-		 i != NULL;
-		 i = tree_Node_Next(i)) {
-		Particle *p = (Particle *)i->data;
-
-		render_SetModes(*p->mode, p->addtime);
-		render_FillCircleW(sys->super, p->pos, p->size);
-	}
+			render_SetModes(*p->mode, p->addtime);
+			render_FillCircleW(sys->super, p->pos, p->size);
+		}
 }
 }
diff --git a/player.c b/player.c
index 9ce2257..f48efd7 100644
--- a/player.c
+++ b/player.c
@@ -83,6 +83,7 @@ void player_Advance(System_Player *sys, Duration deltaTime) {
 			Vec2 to_pos  = vec2_Add(p->super->position->position, vec2(0, -p->super->hitbox->box.size.y / 2.0));
 			particle_Emit(
 				sys->super->particle,
+				3,
 				vec2_Add(vec2_Random(-5, 5, -30, 30), to_pos),
 				vec2(rand_DoubleRange(650, 700) * -p->faceDirection, rand_DoubleRange(-100, 100)),
 				7, rand_DoubleRange(14, 20), rand_DoubleRange(32, 40),
@@ -98,6 +99,7 @@ void player_Advance(System_Player *sys, Duration deltaTime) {
 			Vec2 to_pos = vec2_Add(p->super->position->position, vec2(0, -p->super->hitbox->box.size.y));
 			particle_Emit(
 				sys->super->particle,
+				3,
 				vec2_Add(vec2_Random(-10, 10, -10, 10), to_pos),
 				vec2_Add(
 					vec2(0, rand_DoubleRange(-200, -240)),
@@ -134,6 +136,7 @@ void player_Advance(System_Player *sys, Duration deltaTime) {
 			for (int i = 0; i < airjumpParticleCount; i++)
 				particle_Emit(
 					sys->super->particle,
+					3,
 					vec2_Add(vec2_Random(-20, 20, -5, 5), p->super->position->position),
 					(p->onGround) ? vec2(rand_DoubleRange(-50, 50), -100) : vec2(0, 200), 2, rand_DoubleRange(8, 12), 20,
 					duration_FromSeconds(0), &render_ModeRotate);
@@ -188,6 +191,7 @@ void player_HazardHarm(System_Player *sys) {
 		double angle        = rand_Double01() * 2.0 * M_PI;
 		particle_Emit(
 			sys->super->particle,
+			3,
 			sys->player->super->position->position,
 			vec2(speed_linear * cos(angle), speed_linear * sin(angle)),
 			rand_DoubleRange(2, 3),
diff --git a/render_bundle.h b/render_bundle.h
index a65cbd6..d8f27be 100644
--- a/render_bundle.h
+++ b/render_bundle.h
@@ -18,8 +18,7 @@ typedef enum {
 
 // render_Primitive describes one render operation.
 typedef struct {
-	FillMode mode;   // fill mode
-	uint32_t fg, bg; // foreground & background colors
+	FillMode mode; // fill mode
 
 	render_PrimitiveType type;
 	vector_Vector       *points; // Vector of Vec2
diff --git a/render_bundle_draw.cpp b/render_bundle_draw.cpp
index 88f21ad..afc3ec4 100644
--- a/render_bundle_draw.cpp
+++ b/render_bundle_draw.cpp
@@ -47,9 +47,6 @@ extern "C" void render_DrawPrimitiveW(App *app, render_Primitive *p, Vec2 offset
 	// See if any of the points are in the camera box
 	if (needDraw) {
 		// Set the colors
-		setlinecolor(p->fg);
-		setfillcolor(p->fg);
-		setbkcolor(p->bg);
 		render_SetModes(p->mode, time_Now());
 
 		// Draw the converted primitive
diff --git a/render_bundle_file.c b/render_bundle_file.c
index 3ef075e..a26c255 100644
--- a/render_bundle_file.c
+++ b/render_bundle_file.c
@@ -51,8 +51,6 @@ static void _render_BundleCommand(char *cmd) {
 		}
 		_tmpp         = malloc(sizeof(render_Primitive));
 		_tmpp->points = vector_Create(sizeof(Vec2));
-		_tmpp->fg     = 0xffffff;
-		_tmpp->bg     = 0;
 		_tmpp->mode   = render_ModeDefault;
 
 		// parse the type
@@ -88,19 +86,19 @@ static void _render_BundleCommand(char *cmd) {
 	} else if (CMD("FG")) {
 		// Set Foreground color
 		if (_tmpp) {
-			int r     = atoi(strtok(NULL, " "));
-			int g     = atoi(strtok(NULL, " "));
-			int b     = atoi(strtok(NULL, " "));
-			_tmpp->fg = RGB(r, g, b);
+			int r          = atoi(strtok(NULL, " "));
+			int g          = atoi(strtok(NULL, " "));
+			int b          = atoi(strtok(NULL, " "));
+			_tmpp->mode.fg = RGB(r, g, b);
 		} else
 			WARN("FG without PRIM first", 0);
 	} else if (CMD("BG")) {
 		// Set Background color
 		if (_tmpp) {
-			int r     = atoi(strtok(NULL, " "));
-			int g     = atoi(strtok(NULL, " "));
-			int b     = atoi(strtok(NULL, " "));
-			_tmpp->bg = RGB(r, g, b);
+			int r          = atoi(strtok(NULL, " "));
+			int g          = atoi(strtok(NULL, " "));
+			int b          = atoi(strtok(NULL, " "));
+			_tmpp->mode.bg = RGB(r, g, b);
 		} else
 			WARN("BG without PRIM first", 0);
 	} else {
diff --git a/render_util.cpp b/render_util.cpp
index 08878d9..d7abddc 100644
--- a/render_util.cpp
+++ b/render_util.cpp
@@ -61,21 +61,27 @@ const FillMode render_ModeDefault = {
 	.hatch    = 0,
 	.rotate   = {.microseconds = 0},
 	.dissolve = {.microseconds = 0},
-	.fadein   = false};
+	.fadein   = false,
+	.bg       = 0,
+	.fg       = 0xffffff};
 const FillMode render_ModeInverse = {
 	.rop2     = R2_NOT,
 	.style    = BS_SOLID,
 	.hatch    = 0,
 	.rotate   = {.microseconds = 0},
 	.dissolve = {.microseconds = 0},
-	.fadein   = false};
+	.fadein   = false,
+	.bg       = 0,
+	.fg       = 0xffffff};
 extern const FillMode render_ModeRotate = {
 	.rop2     = R2_COPYPEN,
 	.style    = BS_SOLID,
 	.hatch    = 0,
 	.rotate   = {.microseconds = 100000},
 	.dissolve = {.microseconds = 0},
-	.fadein   = false};
+	.fadein   = false,
+	.bg       = 0,
+	.fg       = 0xffffff};
 
 
 void render_SetModes(FillMode mode, TimePoint since) {
@@ -97,12 +103,17 @@ void render_SetModes(FillMode mode, TimePoint since) {
 		static const long hatches[] = {HS_HORIZONTAL, HS_FDIAGONAL, HS_VERTICAL, HS_BDIAGONAL};
 		setfillstyle(BS_HATCHED, hatches[steps % 4], NULL);
 		setrop2(R2_COPYPEN);
+		setfillcolor(0xffffff);
+		setbkcolor(0);
 		return;
 	}
 
 	// Normal mode
 	setfillstyle(mode.style, mode.hatch, NULL);
 	setrop2(mode.rop2);
+	setlinecolor(mode.fg);
+	setfillcolor(mode.fg);
+	setbkcolor(mode.bg);
 }
 
 void render_FillScreen() {
diff --git a/render_util.h b/render_util.h
index 135ac4a..077cf18 100644
--- a/render_util.h
+++ b/render_util.h
@@ -43,6 +43,7 @@ typedef struct {
 	// amount of time. Overrides rotate, style & hatch
 	Duration dissolve;
 	bool     fadein; // Fade Into being full for true, fade out of otherwise
+	uint32_t bg, fg; // Background & foreground colors
 } FillMode;
 
 // Default fill mode.