diff --git a/gba/cartest/data/smoke.bin b/gba/cartest/data/smoke.bin
new file mode 100644
index 0000000..1b325c1
Binary files /dev/null and b/gba/cartest/data/smoke.bin differ
diff --git a/gba/cartest/data/smoke.xcf b/gba/cartest/data/smoke.xcf
new file mode 100644
index 0000000..583f045
Binary files /dev/null and b/gba/cartest/data/smoke.xcf differ
diff --git a/gba/cartest/src/cartest.c b/gba/cartest/src/cartest.c
index a5a4b27..f345176 100644
--- a/gba/cartest/src/cartest.c
+++ b/gba/cartest/src/cartest.c
@@ -14,8 +14,7 @@
 // headers for binary data generated by bin2o macro in makefile
 #include "car_pal_bin.h"
 #include "car_bin.h"
-#include "chaser_bin.h"
-
+#include "smoke_bin.h"
 
 #include "sinlut.h"
 
@@ -30,11 +29,12 @@ typedef s32 FIXED; // 32bit FIXED in 24.8 format
 #define lut_cos(x)  _sinLUT[(x + (SIN_SIZE>>2)) & SIN_MASK]
 
 
-#define NUMCHASERS 10
+#define NUMSMOKES 20
 
 u16 PaletteBuffer[256];
-OBJATTR oe_buffer[1+NUMCHASERS];
+OBJATTR oe_buffer[1+NUMSMOKES];
 OBJAFFINE *const oa_buffer = (OBJAFFINE*)oe_buffer;
+s8 smoke_frame[NUMSMOKES];
 
 unsigned int frame;
 
@@ -48,8 +48,8 @@ int main(void)
 {
 	OBJATTR*car = &oe_buffer[0];
 	OBJAFFINE*car_aff = &oa_buffer[0];
-	// We'll make a few chasers
-	OBJATTR*chasers = &oe_buffer[1];
+	// We'll make a few smoke clouds
+	OBJATTR*smokes = &oe_buffer[1];
 
 	// Set up the interrupt handlers
 	InitInterrupt();
@@ -72,20 +72,23 @@ int main(void)
 	void* free_space = BITMAP_OBJ_BASE_ADR;
 	CpuFastSet(car_bin, free_space, COPY32 | car_bin_size/4);
 	free_space += car_bin_size;
-	CpuFastSet(chaser_bin, free_space, COPY32 | chaser_bin_size/4);
-	free_space += chaser_bin_size;
+
        	CpuFastSet(car_pal_bin, OBJ_COLORS, COPY32 | car_pal_bin_size/4);
 
+	// load smoke
+	CpuFastSet(smoke_bin, free_space, COPY32 | smoke_bin_size/4);
+	free_space += smoke_bin_size;
+
 	car->attr2 = OBJ_CHAR(512);
 
-	s32 base = (s32)(0.707106781 * 256);
-	s32 one = 1 << 8;
+	u8 next_smoke = 0;
 
 	u8 i;
-	for (i=0; i<NUMCHASERS; i++) {
-	  chasers[i].attr2 = OBJ_CHAR(520);
-	  chasers[i].attr1 = OBJ_X(20+(i*10));
-	  chasers[i].attr0 = OBJ_256_COLOR | OBJ_DOUBLE | OBJ_ROT_SCALE_ON | OBJ_Y(40);
+	for (i=0; i<NUMSMOKES; i++) {
+	  smokes[i].attr1 = OBJ_X(20+(i*10));
+	  smokes[i].attr0 = OBJ_256_COLOR | OBJ_Y(40);
+	  // 6 == off
+	  smoke_frame[i] = 6;
 	}
 
 	FIXED x = INT2FIX(112);
@@ -157,6 +160,35 @@ int main(void)
 		car->attr1 = OBJ_SIZE(1) | OBJ_X(FIX2INT(x));
 		car->attr0 = OBJ_256_COLOR | OBJ_DOUBLE | OBJ_ROT_SCALE_ON | OBJ_Y(FIX2INT(y));
 
+		// Update smoke cloud frames
+		if ((frame & 3) == 3) {
+		  for (i=0; i<NUMSMOKES; i++) {
+		    if (smoke_frame[i] < 6) {
+		      smoke_frame[i] += 1;
+		    }
+		  }
+		}
+
+		// place a new smoke cloud after car if driving
+		// forwards
+		if ((speed!=0) && ((frame & 1) == 1)) {
+		  for (i=0; i<NUMSMOKES; i++) {
+		    if (smoke_frame[i] == 6) {
+		      smoke_frame[i] = 0;
+		      smokes[i].attr1 = OBJ_X(FIX2INT(x)+12);
+		      smokes[i].attr0 = OBJ_256_COLOR | OBJ_Y(FIX2INT(y)+12);
+		      break;
+		    }
+		  }
+		}
+		next_smoke += 1;		
+		if (next_smoke>=NUMSMOKES) {
+		  next_smoke = 1;
+		}
+
+		for (i=0; i<NUMSMOKES; i++)
+		  smokes[i].attr2 = OBJ_CHAR(520 + 2*smoke_frame[i]);
+		
 	  	VBlankIntrWait();
 		CpuFastSet(oe_buffer, OAM, COPY32 | sizeof(oe_buffer)/4);
 	}