diff --git a/arena.c b/arena.c
index d56e350..9616cc5 100644
--- a/arena.c
+++ b/arena.c
@@ -3,6 +3,9 @@
 #include "arena.h"
 #include "system/vga.h"
 
+#include "sprites.h"
+#include <stdlib.h>
+
 char arenaLayout[10][10] = {
   { 1, 1, 1, 1, 0, 0, 1, 1, 1, 1 },
   { 1, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
@@ -16,36 +19,35 @@ char arenaLayout[10][10] = {
   { 1, 1, 1, 1, 0, 0, 1, 1, 1, 1 }
 };
 
-struct SpriteRender arenaWallTop, arenaWallSide, arenaFloor;
+struct CompiledSpriteRender arenaWallTop, arenaWallSide, arenaFloor;
 
-void setupWallSprites(struct BMPImage *spritesheetImage) {
-  buildSpriteFromSpritesheet(
-    spritesheetImage,
+void setupWallSprites() {
+  buildCompiledSprite(
+    &sprite_arenaWallTop,
     &arenaWallTop,
-    0, 0, 20, 20
+    20, 20
   );
 
-  buildSpriteFromSpritesheet(
-    spritesheetImage,
+  buildCompiledSprite(
+    &sprite_arenaWallSide,
     &arenaWallSide,
-    20, 0, 20, 20
+    20, 20
   );
 
-  buildSpriteFromSpritesheet(
-    spritesheetImage,
+  buildCompiledSprite(
+    &sprite_arenaFloor,
     &arenaFloor,
-    40, 0, 20, 20
+    20, 20
   );
 }
 
-extern void renderFloorTile(byte *);
-// push items onto stack
-#pragma aux (__cdecl) renderFloorTile "renderFloorTile_"
+byte *drawBuffer;
 
 void renderArenaTile(int x, int y) {
   char tile;
-  struct SpriteRender *target;
-  byte *drawBuffer;
+  struct CompiledSpriteRender *target;
+
+  drawBuffer = getDrawBuffer();
 
   tile = arenaLayout[y][x];
 
@@ -64,15 +66,7 @@ void renderArenaTile(int x, int y) {
   target->x = x * TILE_SIZE;
   target->y = y * TILE_SIZE;
 
-  if (tile == 0) {
-    drawBuffer = getDrawBuffer();
-
-    renderFloorTile(
-      drawBuffer + target->x + target->y * VGA_DISPLAY_WIDTH
-    );
-  } else {
-    drawSprite(target);
-  }
+  drawCompiledSprite(target);
 }
 
 char arenaRedrawRequests[ARENA_HEIGHT_TILES][ARENA_WIDTH_TILES];
diff --git a/bin/build_spritesheet_asm.rb b/bin/build_spritesheet_asm.rb
index dffed0f..b80f06b 100755
--- a/bin/build_spritesheet_asm.rb
+++ b/bin/build_spritesheet_asm.rb
@@ -49,14 +49,10 @@ ASM_TEMPLATE = <<~ASM
   <%= sprite.exported_name %>:
     push ebp
     mov ebp, esp
-    push ebx
-
-    mov eax, [ebp + 8]
 
     <% sprite.bytes.each do |byte| %>
     mov BYTE PTR [eax + <%= byte.offset %>], <%= byte.data %><% end %>
 
-    pop ebx
     pop ebp
     ret
 
@@ -65,10 +61,18 @@ ASM_TEMPLATE = <<~ASM
 ASM
 
 C_TEMPLATE = <<~C
+  #ifndef __SPRITES_H__
+  #define __SPRITES_H__
+
+  #include "types.h"
+
   <% sprites.each do |sprite| %>
   extern void <%= sprite.function_name %>(byte *);
-  #pragma aux (__cdecl) <%= sprite.function_name %> "<%= sprite.exported_name %>"
   <% end %>
+
+  // TODO: something with bounds checking here
+
+  #endif
 C
 
 class AssemblerSprite
diff --git a/game.c b/game.c
index 286b13c..cbd3f83 100644
--- a/game.c
+++ b/game.c
@@ -4,6 +4,7 @@
 #include <stdlib.h>
 #include <time.h>
 
+#include "sprites.h"
 #include "system/vga.h"
 #include "system/keyboard.h"
 #include "system/mouse_io.h"
@@ -334,10 +335,15 @@ clock_t startTime;
 // non cdecl is put params into eax, ebx, and ecx
 
 int main(void) {
+  byte *drawBuffer;
   int keepRunning = 1;
 
+  void (*code)(byte *);
+
   if (setupGame()) return 1;
 
+  drawBuffer = getDrawBuffer();
+
   maybeSpawnEnemy();
 
   while (keepRunning) {
diff --git a/makefile b/makefile
index 6aafbe6..32aab2c 100644
--- a/makefile
+++ b/makefile
@@ -1,4 +1,4 @@
-obj = game.o bmpload.o arena.o movement.o test.o
+obj = game.o bmpload.o arena.o movement.o sprites.o
 
 all: system/system.lib game.exe .SYMBOLIC
 
diff --git a/sprites.asm b/sprites.asm
index b47b482..79140ea 100644
--- a/sprites.asm
+++ b/sprites.asm
@@ -16,221 +16,8 @@ PUBLIC sprite_enemy_
 sprite_arenaWallTop_:
   push ebp
   mov ebp, esp
-  push ebx
-
-  mov eax, [ebp + 8]
 
   
-  mov BYTE PTR [eax + -3210], 2
-  mov BYTE PTR [eax + -3209], 2
-  mov BYTE PTR [eax + -3208], 2
-  mov BYTE PTR [eax + -3207], 2
-  mov BYTE PTR [eax + -3206], 2
-  mov BYTE PTR [eax + -3205], 2
-  mov BYTE PTR [eax + -3204], 2
-  mov BYTE PTR [eax + -3203], 2
-  mov BYTE PTR [eax + -3202], 2
-  mov BYTE PTR [eax + -3201], 2
-  mov BYTE PTR [eax + -3200], 2
-  mov BYTE PTR [eax + -3199], 2
-  mov BYTE PTR [eax + -3198], 2
-  mov BYTE PTR [eax + -3197], 2
-  mov BYTE PTR [eax + -3196], 2
-  mov BYTE PTR [eax + -3195], 2
-  mov BYTE PTR [eax + -3194], 2
-  mov BYTE PTR [eax + -3193], 2
-  mov BYTE PTR [eax + -3192], 2
-  mov BYTE PTR [eax + -3191], 2
-  mov BYTE PTR [eax + -2890], 2
-  mov BYTE PTR [eax + -2889], 2
-  mov BYTE PTR [eax + -2888], 2
-  mov BYTE PTR [eax + -2887], 2
-  mov BYTE PTR [eax + -2886], 2
-  mov BYTE PTR [eax + -2885], 2
-  mov BYTE PTR [eax + -2884], 2
-  mov BYTE PTR [eax + -2883], 2
-  mov BYTE PTR [eax + -2882], 2
-  mov BYTE PTR [eax + -2881], 2
-  mov BYTE PTR [eax + -2880], 2
-  mov BYTE PTR [eax + -2879], 2
-  mov BYTE PTR [eax + -2878], 2
-  mov BYTE PTR [eax + -2877], 2
-  mov BYTE PTR [eax + -2876], 2
-  mov BYTE PTR [eax + -2875], 2
-  mov BYTE PTR [eax + -2874], 2
-  mov BYTE PTR [eax + -2873], 2
-  mov BYTE PTR [eax + -2872], 2
-  mov BYTE PTR [eax + -2871], 2
-  mov BYTE PTR [eax + -2570], 2
-  mov BYTE PTR [eax + -2569], 2
-  mov BYTE PTR [eax + -2568], 2
-  mov BYTE PTR [eax + -2567], 2
-  mov BYTE PTR [eax + -2566], 2
-  mov BYTE PTR [eax + -2565], 2
-  mov BYTE PTR [eax + -2564], 2
-  mov BYTE PTR [eax + -2563], 2
-  mov BYTE PTR [eax + -2562], 2
-  mov BYTE PTR [eax + -2561], 2
-  mov BYTE PTR [eax + -2560], 2
-  mov BYTE PTR [eax + -2559], 2
-  mov BYTE PTR [eax + -2558], 2
-  mov BYTE PTR [eax + -2557], 2
-  mov BYTE PTR [eax + -2556], 2
-  mov BYTE PTR [eax + -2555], 2
-  mov BYTE PTR [eax + -2554], 2
-  mov BYTE PTR [eax + -2553], 2
-  mov BYTE PTR [eax + -2552], 2
-  mov BYTE PTR [eax + -2551], 2
-  mov BYTE PTR [eax + -2250], 2
-  mov BYTE PTR [eax + -2249], 2
-  mov BYTE PTR [eax + -2248], 2
-  mov BYTE PTR [eax + -2247], 2
-  mov BYTE PTR [eax + -2246], 2
-  mov BYTE PTR [eax + -2245], 2
-  mov BYTE PTR [eax + -2244], 2
-  mov BYTE PTR [eax + -2243], 2
-  mov BYTE PTR [eax + -2242], 2
-  mov BYTE PTR [eax + -2241], 2
-  mov BYTE PTR [eax + -2240], 2
-  mov BYTE PTR [eax + -2239], 2
-  mov BYTE PTR [eax + -2238], 2
-  mov BYTE PTR [eax + -2237], 2
-  mov BYTE PTR [eax + -2236], 2
-  mov BYTE PTR [eax + -2235], 2
-  mov BYTE PTR [eax + -2234], 2
-  mov BYTE PTR [eax + -2233], 2
-  mov BYTE PTR [eax + -2232], 2
-  mov BYTE PTR [eax + -2231], 2
-  mov BYTE PTR [eax + -1930], 2
-  mov BYTE PTR [eax + -1929], 2
-  mov BYTE PTR [eax + -1928], 2
-  mov BYTE PTR [eax + -1927], 2
-  mov BYTE PTR [eax + -1926], 2
-  mov BYTE PTR [eax + -1925], 2
-  mov BYTE PTR [eax + -1924], 2
-  mov BYTE PTR [eax + -1923], 2
-  mov BYTE PTR [eax + -1922], 2
-  mov BYTE PTR [eax + -1921], 2
-  mov BYTE PTR [eax + -1920], 2
-  mov BYTE PTR [eax + -1919], 2
-  mov BYTE PTR [eax + -1918], 2
-  mov BYTE PTR [eax + -1917], 2
-  mov BYTE PTR [eax + -1916], 2
-  mov BYTE PTR [eax + -1915], 2
-  mov BYTE PTR [eax + -1914], 2
-  mov BYTE PTR [eax + -1913], 2
-  mov BYTE PTR [eax + -1912], 2
-  mov BYTE PTR [eax + -1911], 2
-  mov BYTE PTR [eax + -1610], 2
-  mov BYTE PTR [eax + -1609], 2
-  mov BYTE PTR [eax + -1608], 2
-  mov BYTE PTR [eax + -1607], 2
-  mov BYTE PTR [eax + -1606], 2
-  mov BYTE PTR [eax + -1605], 2
-  mov BYTE PTR [eax + -1604], 2
-  mov BYTE PTR [eax + -1603], 2
-  mov BYTE PTR [eax + -1602], 2
-  mov BYTE PTR [eax + -1601], 2
-  mov BYTE PTR [eax + -1600], 2
-  mov BYTE PTR [eax + -1599], 2
-  mov BYTE PTR [eax + -1598], 2
-  mov BYTE PTR [eax + -1597], 2
-  mov BYTE PTR [eax + -1596], 2
-  mov BYTE PTR [eax + -1595], 2
-  mov BYTE PTR [eax + -1594], 2
-  mov BYTE PTR [eax + -1593], 2
-  mov BYTE PTR [eax + -1592], 2
-  mov BYTE PTR [eax + -1591], 2
-  mov BYTE PTR [eax + -1290], 2
-  mov BYTE PTR [eax + -1289], 2
-  mov BYTE PTR [eax + -1288], 2
-  mov BYTE PTR [eax + -1287], 2
-  mov BYTE PTR [eax + -1286], 2
-  mov BYTE PTR [eax + -1285], 2
-  mov BYTE PTR [eax + -1284], 2
-  mov BYTE PTR [eax + -1283], 2
-  mov BYTE PTR [eax + -1282], 2
-  mov BYTE PTR [eax + -1281], 2
-  mov BYTE PTR [eax + -1280], 2
-  mov BYTE PTR [eax + -1279], 2
-  mov BYTE PTR [eax + -1278], 2
-  mov BYTE PTR [eax + -1277], 2
-  mov BYTE PTR [eax + -1276], 2
-  mov BYTE PTR [eax + -1275], 2
-  mov BYTE PTR [eax + -1274], 2
-  mov BYTE PTR [eax + -1273], 2
-  mov BYTE PTR [eax + -1272], 2
-  mov BYTE PTR [eax + -1271], 2
-  mov BYTE PTR [eax + -970], 2
-  mov BYTE PTR [eax + -969], 2
-  mov BYTE PTR [eax + -968], 2
-  mov BYTE PTR [eax + -967], 2
-  mov BYTE PTR [eax + -966], 2
-  mov BYTE PTR [eax + -965], 2
-  mov BYTE PTR [eax + -964], 2
-  mov BYTE PTR [eax + -963], 2
-  mov BYTE PTR [eax + -962], 2
-  mov BYTE PTR [eax + -961], 2
-  mov BYTE PTR [eax + -960], 2
-  mov BYTE PTR [eax + -959], 2
-  mov BYTE PTR [eax + -958], 2
-  mov BYTE PTR [eax + -957], 2
-  mov BYTE PTR [eax + -956], 2
-  mov BYTE PTR [eax + -955], 2
-  mov BYTE PTR [eax + -954], 2
-  mov BYTE PTR [eax + -953], 2
-  mov BYTE PTR [eax + -952], 2
-  mov BYTE PTR [eax + -951], 2
-  mov BYTE PTR [eax + -650], 2
-  mov BYTE PTR [eax + -649], 2
-  mov BYTE PTR [eax + -648], 2
-  mov BYTE PTR [eax + -647], 2
-  mov BYTE PTR [eax + -646], 2
-  mov BYTE PTR [eax + -645], 2
-  mov BYTE PTR [eax + -644], 2
-  mov BYTE PTR [eax + -643], 2
-  mov BYTE PTR [eax + -642], 2
-  mov BYTE PTR [eax + -641], 2
-  mov BYTE PTR [eax + -640], 2
-  mov BYTE PTR [eax + -639], 2
-  mov BYTE PTR [eax + -638], 2
-  mov BYTE PTR [eax + -637], 2
-  mov BYTE PTR [eax + -636], 2
-  mov BYTE PTR [eax + -635], 2
-  mov BYTE PTR [eax + -634], 2
-  mov BYTE PTR [eax + -633], 2
-  mov BYTE PTR [eax + -632], 2
-  mov BYTE PTR [eax + -631], 2
-  mov BYTE PTR [eax + -330], 2
-  mov BYTE PTR [eax + -329], 2
-  mov BYTE PTR [eax + -328], 2
-  mov BYTE PTR [eax + -327], 2
-  mov BYTE PTR [eax + -326], 2
-  mov BYTE PTR [eax + -325], 2
-  mov BYTE PTR [eax + -324], 2
-  mov BYTE PTR [eax + -323], 2
-  mov BYTE PTR [eax + -322], 2
-  mov BYTE PTR [eax + -321], 2
-  mov BYTE PTR [eax + -320], 2
-  mov BYTE PTR [eax + -319], 2
-  mov BYTE PTR [eax + -318], 2
-  mov BYTE PTR [eax + -317], 2
-  mov BYTE PTR [eax + -316], 2
-  mov BYTE PTR [eax + -315], 2
-  mov BYTE PTR [eax + -314], 2
-  mov BYTE PTR [eax + -313], 2
-  mov BYTE PTR [eax + -312], 2
-  mov BYTE PTR [eax + -311], 2
-  mov BYTE PTR [eax + -10], 2
-  mov BYTE PTR [eax + -9], 2
-  mov BYTE PTR [eax + -8], 2
-  mov BYTE PTR [eax + -7], 2
-  mov BYTE PTR [eax + -6], 2
-  mov BYTE PTR [eax + -5], 2
-  mov BYTE PTR [eax + -4], 2
-  mov BYTE PTR [eax + -3], 2
-  mov BYTE PTR [eax + -2], 2
-  mov BYTE PTR [eax + -1], 2
   mov BYTE PTR [eax + 0], 2
   mov BYTE PTR [eax + 1], 2
   mov BYTE PTR [eax + 2], 2
@@ -241,16 +28,16 @@ sprite_arenaWallTop_:
   mov BYTE PTR [eax + 7], 2
   mov BYTE PTR [eax + 8], 2
   mov BYTE PTR [eax + 9], 2
-  mov BYTE PTR [eax + 310], 2
-  mov BYTE PTR [eax + 311], 2
-  mov BYTE PTR [eax + 312], 2
-  mov BYTE PTR [eax + 313], 2
-  mov BYTE PTR [eax + 314], 2
-  mov BYTE PTR [eax + 315], 2
-  mov BYTE PTR [eax + 316], 2
-  mov BYTE PTR [eax + 317], 2
-  mov BYTE PTR [eax + 318], 2
-  mov BYTE PTR [eax + 319], 2
+  mov BYTE PTR [eax + 10], 2
+  mov BYTE PTR [eax + 11], 2
+  mov BYTE PTR [eax + 12], 2
+  mov BYTE PTR [eax + 13], 2
+  mov BYTE PTR [eax + 14], 2
+  mov BYTE PTR [eax + 15], 2
+  mov BYTE PTR [eax + 16], 2
+  mov BYTE PTR [eax + 17], 2
+  mov BYTE PTR [eax + 18], 2
+  mov BYTE PTR [eax + 19], 2
   mov BYTE PTR [eax + 320], 2
   mov BYTE PTR [eax + 321], 2
   mov BYTE PTR [eax + 322], 2
@@ -261,16 +48,16 @@ sprite_arenaWallTop_:
   mov BYTE PTR [eax + 327], 2
   mov BYTE PTR [eax + 328], 2
   mov BYTE PTR [eax + 329], 2
-  mov BYTE PTR [eax + 630], 2
-  mov BYTE PTR [eax + 631], 2
-  mov BYTE PTR [eax + 632], 2
-  mov BYTE PTR [eax + 633], 2
-  mov BYTE PTR [eax + 634], 2
-  mov BYTE PTR [eax + 635], 2
-  mov BYTE PTR [eax + 636], 2
-  mov BYTE PTR [eax + 637], 2
-  mov BYTE PTR [eax + 638], 2
-  mov BYTE PTR [eax + 639], 2
+  mov BYTE PTR [eax + 330], 2
+  mov BYTE PTR [eax + 331], 2
+  mov BYTE PTR [eax + 332], 2
+  mov BYTE PTR [eax + 333], 2
+  mov BYTE PTR [eax + 334], 2
+  mov BYTE PTR [eax + 335], 2
+  mov BYTE PTR [eax + 336], 2
+  mov BYTE PTR [eax + 337], 2
+  mov BYTE PTR [eax + 338], 2
+  mov BYTE PTR [eax + 339], 2
   mov BYTE PTR [eax + 640], 2
   mov BYTE PTR [eax + 641], 2
   mov BYTE PTR [eax + 642], 2
@@ -281,16 +68,16 @@ sprite_arenaWallTop_:
   mov BYTE PTR [eax + 647], 2
   mov BYTE PTR [eax + 648], 2
   mov BYTE PTR [eax + 649], 2
-  mov BYTE PTR [eax + 950], 2
-  mov BYTE PTR [eax + 951], 2
-  mov BYTE PTR [eax + 952], 2
-  mov BYTE PTR [eax + 953], 2
-  mov BYTE PTR [eax + 954], 2
-  mov BYTE PTR [eax + 955], 2
-  mov BYTE PTR [eax + 956], 2
-  mov BYTE PTR [eax + 957], 2
-  mov BYTE PTR [eax + 958], 2
-  mov BYTE PTR [eax + 959], 2
+  mov BYTE PTR [eax + 650], 2
+  mov BYTE PTR [eax + 651], 2
+  mov BYTE PTR [eax + 652], 2
+  mov BYTE PTR [eax + 653], 2
+  mov BYTE PTR [eax + 654], 2
+  mov BYTE PTR [eax + 655], 2
+  mov BYTE PTR [eax + 656], 2
+  mov BYTE PTR [eax + 657], 2
+  mov BYTE PTR [eax + 658], 2
+  mov BYTE PTR [eax + 659], 2
   mov BYTE PTR [eax + 960], 2
   mov BYTE PTR [eax + 961], 2
   mov BYTE PTR [eax + 962], 2
@@ -301,16 +88,16 @@ sprite_arenaWallTop_:
   mov BYTE PTR [eax + 967], 2
   mov BYTE PTR [eax + 968], 2
   mov BYTE PTR [eax + 969], 2
-  mov BYTE PTR [eax + 1270], 2
-  mov BYTE PTR [eax + 1271], 2
-  mov BYTE PTR [eax + 1272], 2
-  mov BYTE PTR [eax + 1273], 2
-  mov BYTE PTR [eax + 1274], 2
-  mov BYTE PTR [eax + 1275], 2
-  mov BYTE PTR [eax + 1276], 2
-  mov BYTE PTR [eax + 1277], 2
-  mov BYTE PTR [eax + 1278], 2
-  mov BYTE PTR [eax + 1279], 2
+  mov BYTE PTR [eax + 970], 2
+  mov BYTE PTR [eax + 971], 2
+  mov BYTE PTR [eax + 972], 2
+  mov BYTE PTR [eax + 973], 2
+  mov BYTE PTR [eax + 974], 2
+  mov BYTE PTR [eax + 975], 2
+  mov BYTE PTR [eax + 976], 2
+  mov BYTE PTR [eax + 977], 2
+  mov BYTE PTR [eax + 978], 2
+  mov BYTE PTR [eax + 979], 2
   mov BYTE PTR [eax + 1280], 2
   mov BYTE PTR [eax + 1281], 2
   mov BYTE PTR [eax + 1282], 2
@@ -321,16 +108,16 @@ sprite_arenaWallTop_:
   mov BYTE PTR [eax + 1287], 2
   mov BYTE PTR [eax + 1288], 2
   mov BYTE PTR [eax + 1289], 2
-  mov BYTE PTR [eax + 1590], 2
-  mov BYTE PTR [eax + 1591], 2
-  mov BYTE PTR [eax + 1592], 2
-  mov BYTE PTR [eax + 1593], 2
-  mov BYTE PTR [eax + 1594], 2
-  mov BYTE PTR [eax + 1595], 2
-  mov BYTE PTR [eax + 1596], 2
-  mov BYTE PTR [eax + 1597], 2
-  mov BYTE PTR [eax + 1598], 2
-  mov BYTE PTR [eax + 1599], 2
+  mov BYTE PTR [eax + 1290], 2
+  mov BYTE PTR [eax + 1291], 2
+  mov BYTE PTR [eax + 1292], 2
+  mov BYTE PTR [eax + 1293], 2
+  mov BYTE PTR [eax + 1294], 2
+  mov BYTE PTR [eax + 1295], 2
+  mov BYTE PTR [eax + 1296], 2
+  mov BYTE PTR [eax + 1297], 2
+  mov BYTE PTR [eax + 1298], 2
+  mov BYTE PTR [eax + 1299], 2
   mov BYTE PTR [eax + 1600], 2
   mov BYTE PTR [eax + 1601], 2
   mov BYTE PTR [eax + 1602], 2
@@ -341,16 +128,16 @@ sprite_arenaWallTop_:
   mov BYTE PTR [eax + 1607], 2
   mov BYTE PTR [eax + 1608], 2
   mov BYTE PTR [eax + 1609], 2
-  mov BYTE PTR [eax + 1910], 2
-  mov BYTE PTR [eax + 1911], 2
-  mov BYTE PTR [eax + 1912], 2
-  mov BYTE PTR [eax + 1913], 2
-  mov BYTE PTR [eax + 1914], 2
-  mov BYTE PTR [eax + 1915], 2
-  mov BYTE PTR [eax + 1916], 2
-  mov BYTE PTR [eax + 1917], 2
-  mov BYTE PTR [eax + 1918], 2
-  mov BYTE PTR [eax + 1919], 2
+  mov BYTE PTR [eax + 1610], 2
+  mov BYTE PTR [eax + 1611], 2
+  mov BYTE PTR [eax + 1612], 2
+  mov BYTE PTR [eax + 1613], 2
+  mov BYTE PTR [eax + 1614], 2
+  mov BYTE PTR [eax + 1615], 2
+  mov BYTE PTR [eax + 1616], 2
+  mov BYTE PTR [eax + 1617], 2
+  mov BYTE PTR [eax + 1618], 2
+  mov BYTE PTR [eax + 1619], 2
   mov BYTE PTR [eax + 1920], 2
   mov BYTE PTR [eax + 1921], 2
   mov BYTE PTR [eax + 1922], 2
@@ -361,16 +148,16 @@ sprite_arenaWallTop_:
   mov BYTE PTR [eax + 1927], 2
   mov BYTE PTR [eax + 1928], 2
   mov BYTE PTR [eax + 1929], 2
-  mov BYTE PTR [eax + 2230], 2
-  mov BYTE PTR [eax + 2231], 2
-  mov BYTE PTR [eax + 2232], 2
-  mov BYTE PTR [eax + 2233], 2
-  mov BYTE PTR [eax + 2234], 2
-  mov BYTE PTR [eax + 2235], 2
-  mov BYTE PTR [eax + 2236], 2
-  mov BYTE PTR [eax + 2237], 2
-  mov BYTE PTR [eax + 2238], 2
-  mov BYTE PTR [eax + 2239], 2
+  mov BYTE PTR [eax + 1930], 2
+  mov BYTE PTR [eax + 1931], 2
+  mov BYTE PTR [eax + 1932], 2
+  mov BYTE PTR [eax + 1933], 2
+  mov BYTE PTR [eax + 1934], 2
+  mov BYTE PTR [eax + 1935], 2
+  mov BYTE PTR [eax + 1936], 2
+  mov BYTE PTR [eax + 1937], 2
+  mov BYTE PTR [eax + 1938], 2
+  mov BYTE PTR [eax + 1939], 2
   mov BYTE PTR [eax + 2240], 2
   mov BYTE PTR [eax + 2241], 2
   mov BYTE PTR [eax + 2242], 2
@@ -381,16 +168,16 @@ sprite_arenaWallTop_:
   mov BYTE PTR [eax + 2247], 2
   mov BYTE PTR [eax + 2248], 2
   mov BYTE PTR [eax + 2249], 2
-  mov BYTE PTR [eax + 2550], 2
-  mov BYTE PTR [eax + 2551], 2
-  mov BYTE PTR [eax + 2552], 2
-  mov BYTE PTR [eax + 2553], 2
-  mov BYTE PTR [eax + 2554], 2
-  mov BYTE PTR [eax + 2555], 2
-  mov BYTE PTR [eax + 2556], 2
-  mov BYTE PTR [eax + 2557], 2
-  mov BYTE PTR [eax + 2558], 2
-  mov BYTE PTR [eax + 2559], 2
+  mov BYTE PTR [eax + 2250], 2
+  mov BYTE PTR [eax + 2251], 2
+  mov BYTE PTR [eax + 2252], 2
+  mov BYTE PTR [eax + 2253], 2
+  mov BYTE PTR [eax + 2254], 2
+  mov BYTE PTR [eax + 2255], 2
+  mov BYTE PTR [eax + 2256], 2
+  mov BYTE PTR [eax + 2257], 2
+  mov BYTE PTR [eax + 2258], 2
+  mov BYTE PTR [eax + 2259], 2
   mov BYTE PTR [eax + 2560], 2
   mov BYTE PTR [eax + 2561], 2
   mov BYTE PTR [eax + 2562], 2
@@ -401,16 +188,16 @@ sprite_arenaWallTop_:
   mov BYTE PTR [eax + 2567], 2
   mov BYTE PTR [eax + 2568], 2
   mov BYTE PTR [eax + 2569], 2
-  mov BYTE PTR [eax + 2870], 2
-  mov BYTE PTR [eax + 2871], 2
-  mov BYTE PTR [eax + 2872], 2
-  mov BYTE PTR [eax + 2873], 2
-  mov BYTE PTR [eax + 2874], 2
-  mov BYTE PTR [eax + 2875], 2
-  mov BYTE PTR [eax + 2876], 2
-  mov BYTE PTR [eax + 2877], 2
-  mov BYTE PTR [eax + 2878], 2
-  mov BYTE PTR [eax + 2879], 2
+  mov BYTE PTR [eax + 2570], 2
+  mov BYTE PTR [eax + 2571], 2
+  mov BYTE PTR [eax + 2572], 2
+  mov BYTE PTR [eax + 2573], 2
+  mov BYTE PTR [eax + 2574], 2
+  mov BYTE PTR [eax + 2575], 2
+  mov BYTE PTR [eax + 2576], 2
+  mov BYTE PTR [eax + 2577], 2
+  mov BYTE PTR [eax + 2578], 2
+  mov BYTE PTR [eax + 2579], 2
   mov BYTE PTR [eax + 2880], 2
   mov BYTE PTR [eax + 2881], 2
   mov BYTE PTR [eax + 2882], 2
@@ -421,8 +208,217 @@ sprite_arenaWallTop_:
   mov BYTE PTR [eax + 2887], 2
   mov BYTE PTR [eax + 2888], 2
   mov BYTE PTR [eax + 2889], 2
+  mov BYTE PTR [eax + 2890], 2
+  mov BYTE PTR [eax + 2891], 2
+  mov BYTE PTR [eax + 2892], 2
+  mov BYTE PTR [eax + 2893], 2
+  mov BYTE PTR [eax + 2894], 2
+  mov BYTE PTR [eax + 2895], 2
+  mov BYTE PTR [eax + 2896], 2
+  mov BYTE PTR [eax + 2897], 2
+  mov BYTE PTR [eax + 2898], 2
+  mov BYTE PTR [eax + 2899], 2
+  mov BYTE PTR [eax + 3200], 2
+  mov BYTE PTR [eax + 3201], 2
+  mov BYTE PTR [eax + 3202], 2
+  mov BYTE PTR [eax + 3203], 2
+  mov BYTE PTR [eax + 3204], 2
+  mov BYTE PTR [eax + 3205], 2
+  mov BYTE PTR [eax + 3206], 2
+  mov BYTE PTR [eax + 3207], 2
+  mov BYTE PTR [eax + 3208], 2
+  mov BYTE PTR [eax + 3209], 2
+  mov BYTE PTR [eax + 3210], 2
+  mov BYTE PTR [eax + 3211], 2
+  mov BYTE PTR [eax + 3212], 2
+  mov BYTE PTR [eax + 3213], 2
+  mov BYTE PTR [eax + 3214], 2
+  mov BYTE PTR [eax + 3215], 2
+  mov BYTE PTR [eax + 3216], 2
+  mov BYTE PTR [eax + 3217], 2
+  mov BYTE PTR [eax + 3218], 2
+  mov BYTE PTR [eax + 3219], 2
+  mov BYTE PTR [eax + 3520], 2
+  mov BYTE PTR [eax + 3521], 2
+  mov BYTE PTR [eax + 3522], 2
+  mov BYTE PTR [eax + 3523], 2
+  mov BYTE PTR [eax + 3524], 2
+  mov BYTE PTR [eax + 3525], 2
+  mov BYTE PTR [eax + 3526], 2
+  mov BYTE PTR [eax + 3527], 2
+  mov BYTE PTR [eax + 3528], 2
+  mov BYTE PTR [eax + 3529], 2
+  mov BYTE PTR [eax + 3530], 2
+  mov BYTE PTR [eax + 3531], 2
+  mov BYTE PTR [eax + 3532], 2
+  mov BYTE PTR [eax + 3533], 2
+  mov BYTE PTR [eax + 3534], 2
+  mov BYTE PTR [eax + 3535], 2
+  mov BYTE PTR [eax + 3536], 2
+  mov BYTE PTR [eax + 3537], 2
+  mov BYTE PTR [eax + 3538], 2
+  mov BYTE PTR [eax + 3539], 2
+  mov BYTE PTR [eax + 3840], 2
+  mov BYTE PTR [eax + 3841], 2
+  mov BYTE PTR [eax + 3842], 2
+  mov BYTE PTR [eax + 3843], 2
+  mov BYTE PTR [eax + 3844], 2
+  mov BYTE PTR [eax + 3845], 2
+  mov BYTE PTR [eax + 3846], 2
+  mov BYTE PTR [eax + 3847], 2
+  mov BYTE PTR [eax + 3848], 2
+  mov BYTE PTR [eax + 3849], 2
+  mov BYTE PTR [eax + 3850], 2
+  mov BYTE PTR [eax + 3851], 2
+  mov BYTE PTR [eax + 3852], 2
+  mov BYTE PTR [eax + 3853], 2
+  mov BYTE PTR [eax + 3854], 2
+  mov BYTE PTR [eax + 3855], 2
+  mov BYTE PTR [eax + 3856], 2
+  mov BYTE PTR [eax + 3857], 2
+  mov BYTE PTR [eax + 3858], 2
+  mov BYTE PTR [eax + 3859], 2
+  mov BYTE PTR [eax + 4160], 2
+  mov BYTE PTR [eax + 4161], 2
+  mov BYTE PTR [eax + 4162], 2
+  mov BYTE PTR [eax + 4163], 2
+  mov BYTE PTR [eax + 4164], 2
+  mov BYTE PTR [eax + 4165], 2
+  mov BYTE PTR [eax + 4166], 2
+  mov BYTE PTR [eax + 4167], 2
+  mov BYTE PTR [eax + 4168], 2
+  mov BYTE PTR [eax + 4169], 2
+  mov BYTE PTR [eax + 4170], 2
+  mov BYTE PTR [eax + 4171], 2
+  mov BYTE PTR [eax + 4172], 2
+  mov BYTE PTR [eax + 4173], 2
+  mov BYTE PTR [eax + 4174], 2
+  mov BYTE PTR [eax + 4175], 2
+  mov BYTE PTR [eax + 4176], 2
+  mov BYTE PTR [eax + 4177], 2
+  mov BYTE PTR [eax + 4178], 2
+  mov BYTE PTR [eax + 4179], 2
+  mov BYTE PTR [eax + 4480], 2
+  mov BYTE PTR [eax + 4481], 2
+  mov BYTE PTR [eax + 4482], 2
+  mov BYTE PTR [eax + 4483], 2
+  mov BYTE PTR [eax + 4484], 2
+  mov BYTE PTR [eax + 4485], 2
+  mov BYTE PTR [eax + 4486], 2
+  mov BYTE PTR [eax + 4487], 2
+  mov BYTE PTR [eax + 4488], 2
+  mov BYTE PTR [eax + 4489], 2
+  mov BYTE PTR [eax + 4490], 2
+  mov BYTE PTR [eax + 4491], 2
+  mov BYTE PTR [eax + 4492], 2
+  mov BYTE PTR [eax + 4493], 2
+  mov BYTE PTR [eax + 4494], 2
+  mov BYTE PTR [eax + 4495], 2
+  mov BYTE PTR [eax + 4496], 2
+  mov BYTE PTR [eax + 4497], 2
+  mov BYTE PTR [eax + 4498], 2
+  mov BYTE PTR [eax + 4499], 2
+  mov BYTE PTR [eax + 4800], 2
+  mov BYTE PTR [eax + 4801], 2
+  mov BYTE PTR [eax + 4802], 2
+  mov BYTE PTR [eax + 4803], 2
+  mov BYTE PTR [eax + 4804], 2
+  mov BYTE PTR [eax + 4805], 2
+  mov BYTE PTR [eax + 4806], 2
+  mov BYTE PTR [eax + 4807], 2
+  mov BYTE PTR [eax + 4808], 2
+  mov BYTE PTR [eax + 4809], 2
+  mov BYTE PTR [eax + 4810], 2
+  mov BYTE PTR [eax + 4811], 2
+  mov BYTE PTR [eax + 4812], 2
+  mov BYTE PTR [eax + 4813], 2
+  mov BYTE PTR [eax + 4814], 2
+  mov BYTE PTR [eax + 4815], 2
+  mov BYTE PTR [eax + 4816], 2
+  mov BYTE PTR [eax + 4817], 2
+  mov BYTE PTR [eax + 4818], 2
+  mov BYTE PTR [eax + 4819], 2
+  mov BYTE PTR [eax + 5120], 2
+  mov BYTE PTR [eax + 5121], 2
+  mov BYTE PTR [eax + 5122], 2
+  mov BYTE PTR [eax + 5123], 2
+  mov BYTE PTR [eax + 5124], 2
+  mov BYTE PTR [eax + 5125], 2
+  mov BYTE PTR [eax + 5126], 2
+  mov BYTE PTR [eax + 5127], 2
+  mov BYTE PTR [eax + 5128], 2
+  mov BYTE PTR [eax + 5129], 2
+  mov BYTE PTR [eax + 5130], 2
+  mov BYTE PTR [eax + 5131], 2
+  mov BYTE PTR [eax + 5132], 2
+  mov BYTE PTR [eax + 5133], 2
+  mov BYTE PTR [eax + 5134], 2
+  mov BYTE PTR [eax + 5135], 2
+  mov BYTE PTR [eax + 5136], 2
+  mov BYTE PTR [eax + 5137], 2
+  mov BYTE PTR [eax + 5138], 2
+  mov BYTE PTR [eax + 5139], 2
+  mov BYTE PTR [eax + 5440], 2
+  mov BYTE PTR [eax + 5441], 2
+  mov BYTE PTR [eax + 5442], 2
+  mov BYTE PTR [eax + 5443], 2
+  mov BYTE PTR [eax + 5444], 2
+  mov BYTE PTR [eax + 5445], 2
+  mov BYTE PTR [eax + 5446], 2
+  mov BYTE PTR [eax + 5447], 2
+  mov BYTE PTR [eax + 5448], 2
+  mov BYTE PTR [eax + 5449], 2
+  mov BYTE PTR [eax + 5450], 2
+  mov BYTE PTR [eax + 5451], 2
+  mov BYTE PTR [eax + 5452], 2
+  mov BYTE PTR [eax + 5453], 2
+  mov BYTE PTR [eax + 5454], 2
+  mov BYTE PTR [eax + 5455], 2
+  mov BYTE PTR [eax + 5456], 2
+  mov BYTE PTR [eax + 5457], 2
+  mov BYTE PTR [eax + 5458], 2
+  mov BYTE PTR [eax + 5459], 2
+  mov BYTE PTR [eax + 5760], 2
+  mov BYTE PTR [eax + 5761], 2
+  mov BYTE PTR [eax + 5762], 2
+  mov BYTE PTR [eax + 5763], 2
+  mov BYTE PTR [eax + 5764], 2
+  mov BYTE PTR [eax + 5765], 2
+  mov BYTE PTR [eax + 5766], 2
+  mov BYTE PTR [eax + 5767], 2
+  mov BYTE PTR [eax + 5768], 2
+  mov BYTE PTR [eax + 5769], 2
+  mov BYTE PTR [eax + 5770], 2
+  mov BYTE PTR [eax + 5771], 2
+  mov BYTE PTR [eax + 5772], 2
+  mov BYTE PTR [eax + 5773], 2
+  mov BYTE PTR [eax + 5774], 2
+  mov BYTE PTR [eax + 5775], 2
+  mov BYTE PTR [eax + 5776], 2
+  mov BYTE PTR [eax + 5777], 2
+  mov BYTE PTR [eax + 5778], 2
+  mov BYTE PTR [eax + 5779], 2
+  mov BYTE PTR [eax + 6080], 2
+  mov BYTE PTR [eax + 6081], 2
+  mov BYTE PTR [eax + 6082], 2
+  mov BYTE PTR [eax + 6083], 2
+  mov BYTE PTR [eax + 6084], 2
+  mov BYTE PTR [eax + 6085], 2
+  mov BYTE PTR [eax + 6086], 2
+  mov BYTE PTR [eax + 6087], 2
+  mov BYTE PTR [eax + 6088], 2
+  mov BYTE PTR [eax + 6089], 2
+  mov BYTE PTR [eax + 6090], 2
+  mov BYTE PTR [eax + 6091], 2
+  mov BYTE PTR [eax + 6092], 2
+  mov BYTE PTR [eax + 6093], 2
+  mov BYTE PTR [eax + 6094], 2
+  mov BYTE PTR [eax + 6095], 2
+  mov BYTE PTR [eax + 6096], 2
+  mov BYTE PTR [eax + 6097], 2
+  mov BYTE PTR [eax + 6098], 2
+  mov BYTE PTR [eax + 6099], 2
 
-  pop ebx
   pop ebp
   ret
 
@@ -430,9 +426,6 @@ sprite_arenaWallTop_:
 sprite_arenaWallSide_:
   push ebp
   mov ebp, esp
-  push ebx
-
-  mov eax, [ebp + 8]
 
   
   mov BYTE PTR [eax + 0], 3
@@ -836,7 +829,6 @@ sprite_arenaWallSide_:
   mov BYTE PTR [eax + 6098], 3
   mov BYTE PTR [eax + 6099], 3
 
-  pop ebx
   pop ebp
   ret
 
@@ -844,9 +836,6 @@ sprite_arenaWallSide_:
 sprite_arenaFloor_:
   push ebp
   mov ebp, esp
-  push ebx
-
-  mov eax, [ebp + 8]
 
   
   mov BYTE PTR [eax + 0], 4
@@ -1250,7 +1239,6 @@ sprite_arenaFloor_:
   mov BYTE PTR [eax + 6098], 4
   mov BYTE PTR [eax + 6099], 4
 
-  pop ebx
   pop ebp
   ret
 
@@ -1258,9 +1246,6 @@ sprite_arenaFloor_:
 sprite_rabbit_:
   push ebp
   mov ebp, esp
-  push ebx
-
-  mov eax, [ebp + 8]
 
   
   mov BYTE PTR [eax + -1921], 1
@@ -1314,7 +1299,6 @@ sprite_rabbit_:
   mov BYTE PTR [eax + 1918], 1
   mov BYTE PTR [eax + 1921], 1
 
-  pop ebx
   pop ebp
   ret
 
@@ -1322,9 +1306,6 @@ sprite_rabbit_:
 sprite_mouse_:
   push ebp
   mov ebp, esp
-  push ebx
-
-  mov eax, [ebp + 8]
 
   
   mov BYTE PTR [eax + -1281], 5
@@ -1344,7 +1325,6 @@ sprite_mouse_:
   mov BYTE PTR [eax + 959], 5
   mov BYTE PTR [eax + 960], 5
 
-  pop ebx
   pop ebp
   ret
 
@@ -1352,9 +1332,6 @@ sprite_mouse_:
 sprite_bullet_:
   push ebp
   mov ebp, esp
-  push ebx
-
-  mov eax, [ebp + 8]
 
   
   mov BYTE PTR [eax + 0], 5
@@ -1362,7 +1339,6 @@ sprite_bullet_:
   mov BYTE PTR [eax + 320], 5
   mov BYTE PTR [eax + 321], 5
 
-  pop ebx
   pop ebp
   ret
 
@@ -1370,9 +1346,6 @@ sprite_bullet_:
 sprite_enemy_:
   push ebp
   mov ebp, esp
-  push ebx
-
-  mov eax, [ebp + 8]
 
   
   mov BYTE PTR [eax + -1921], 1
@@ -1426,7 +1399,6 @@ sprite_enemy_:
   mov BYTE PTR [eax + 1918], 1
   mov BYTE PTR [eax + 1921], 1
 
-  pop ebx
   pop ebp
   ret
 
diff --git a/sprites.h b/sprites.h
index f2d86c5..4beed32 100644
--- a/sprites.h
+++ b/sprites.h
@@ -1,22 +1,24 @@
+#ifndef __SPRITES_H__
+#define __SPRITES_H__
+
+#include "types.h"
+
 
 extern void sprite_arenaWallTop(byte *);
-#pragma aux (__cdecl) sprite_arenaWallTop "sprite_arenaWallTop_"
 
 extern void sprite_arenaWallSide(byte *);
-#pragma aux (__cdecl) sprite_arenaWallSide "sprite_arenaWallSide_"
 
 extern void sprite_arenaFloor(byte *);
-#pragma aux (__cdecl) sprite_arenaFloor "sprite_arenaFloor_"
 
 extern void sprite_rabbit(byte *);
-#pragma aux (__cdecl) sprite_rabbit "sprite_rabbit_"
 
 extern void sprite_mouse(byte *);
-#pragma aux (__cdecl) sprite_mouse "sprite_mouse_"
 
 extern void sprite_bullet(byte *);
-#pragma aux (__cdecl) sprite_bullet "sprite_bullet_"
 
 extern void sprite_enemy(byte *);
-#pragma aux (__cdecl) sprite_enemy "sprite_enemy_"
 
+
+// TODO: something with bounds checking here
+
+#endif
diff --git a/spritesheet.yml b/spritesheet.yml
index a1b6bdc..596a9a7 100644
--- a/spritesheet.yml
+++ b/spritesheet.yml
@@ -8,7 +8,7 @@ files:
       arenaWallTop:
         position: [0, 0]
         dimensions: [20, 20]
-        offset: [10, 10]
+        offset: [0, 0]
       arenaWallSide:
         position: [20, 0]
         dimensions: [20, 20]
diff --git a/system/vga.c b/system/vga.c
index 17ab604..1ff251c 100644
--- a/system/vga.c
+++ b/system/vga.c
@@ -50,6 +50,17 @@ void buildSpriteFromSpritesheet(
   spriteRender->transparentColor = spritesheetImage->transparentColor;
 }
 
+void buildCompiledSprite(
+  void (*code)(byte *),
+  struct CompiledSpriteRender *compiledSpriteRender,
+  int width,
+  int height
+) {
+  compiledSpriteRender->code = code;
+  compiledSpriteRender->width = width;
+  compiledSpriteRender->height = height;
+}
+
 void drawPixel(int x, int y, int color) {
   drawBuffer[y * VGA_DISPLAY_WIDTH + x] = color;
 }
@@ -83,6 +94,13 @@ void drawSprite(struct SpriteRender* sprite) {
   }
 }
 
+void drawCompiledSprite(struct CompiledSpriteRender* compiledSprite) {
+  byte *drawBufferPos = drawBuffer +
+    compiledSprite->x + compiledSprite->y * VGA_DISPLAY_WIDTH;
+
+  compiledSprite->code(drawBufferPos);
+}
+
 void getSpriteBounds(struct SpriteRender *sprite, struct SpriteBounds *bounds) {
   bounds->top = sprite->y - sprite->offsetY;
   bounds->bottom = bounds->top + sprite->height;
diff --git a/system/vga.h b/system/vga.h
index 29db2bd..0619c4e 100644
--- a/system/vga.h
+++ b/system/vga.h
@@ -28,6 +28,14 @@ struct SpriteRender {
   int offsetY;
 };
 
+struct CompiledSpriteRender {
+  void (*code)(byte *);
+  int x;
+  int y;
+  unsigned int width;
+  unsigned int height;
+};
+
 struct SpriteBounds {
   int top;
   int right;
@@ -38,7 +46,9 @@ struct SpriteBounds {
 void drawPixel(int x, int y, int color);
 
 void drawSprite(struct SpriteRender *sprite);
+void drawCompiledSprite(struct CompiledSpriteRender *compiledSprite);
 void buildSpriteFromSpritesheet(struct BMPImage*, struct SpriteRender*, int, int, int, int);
+void buildCompiledSprite(void (*)(byte *), struct CompiledSpriteRender*, int width, int height);
 void getSpriteBounds(struct SpriteRender *sprite, struct SpriteBounds *bounds);
 
 byte *initializeDrawBuffer();