diff --git a/res/sprites.c b/res/sprites.c
index 82adceb..5f0a977 100644
--- a/res/sprites.c
+++ b/res/sprites.c
@@ -22,6 +22,8 @@
 
 */
 
+#include "../src/sprite.h"
+
 /* Start of tile array. */
 unsigned char sprites[] =
 {
@@ -49,4 +51,20 @@ unsigned char sprites[] =
   0x7E,0x7E,0x3C,0x3C,0xDB,0xDB,0x43,0xC3
 };
 
+
+// define the collision box of each sprite in the tileset
+SpriteCorners sprite_offsets[] = {
+	{ .itl = { .x = 8, .y = 8}, .itr = { .x = 1, .y = 8}, .ibl = { .x = 8, .y = 1}, .ibr = { .x = 1, .y = 1}, },
+	{ .itl = { .x = 8, .y = 8}, .itr = { .x = 1, .y = 8}, .ibl = { .x = 8, .y = 1}, .ibr = { .x = 1, .y = 1}, },
+	{ .itl = { .x = 8, .y = 8}, .itr = { .x = 1, .y = 8}, .ibl = { .x = 8, .y = 1}, .ibr = { .x = 1, .y = 1}, },
+	{ .itl = { .x = 8, .y = 8}, .itr = { .x = 1, .y = 8}, .ibl = { .x = 8, .y = 1}, .ibr = { .x = 1, .y = 1}, },
+	{ .itl = { .x = 8, .y = 8}, .itr = { .x = 1, .y = 8}, .ibl = { .x = 8, .y = 1}, .ibr = { .x = 1, .y = 1}, },
+	{ .itl = { .x = 8, .y = 8}, .itr = { .x = 1, .y = 8}, .ibl = { .x = 8, .y = 1}, .ibr = { .x = 1, .y = 1}, },
+	{ .itl = { .x = 8, .y = 8}, .itr = { .x = 1, .y = 8}, .ibl = { .x = 8, .y = 1}, .ibr = { .x = 1, .y = 1}, },
+	{ .itl = { .x = 8, .y = 8}, .itr = { .x = 1, .y = 8}, .ibl = { .x = 8, .y = 1}, .ibr = { .x = 1, .y = 1}, },
+	{ .itl = { .x = 8, .y = 8}, .itr = { .x = 1, .y = 8}, .ibl = { .x = 8, .y = 1}, .ibr = { .x = 1, .y = 1}, },
+	{ .itl = { .x = 8, .y = 8}, .itr = { .x = 1, .y = 8}, .ibl = { .x = 8, .y = 1}, .ibr = { .x = 1, .y = 1}, },
+	{ .itl = { .x = 8, .y = 8}, .itr = { .x = 1, .y = 8}, .ibl = { .x = 8, .y = 1}, .ibr = { .x = 1, .y = 1}, }
+};
+
 /* End of SPRITES.C */
diff --git a/res/sprites.h b/res/sprites.h
index 0fba763..54bcfa6 100644
--- a/res/sprites.h
+++ b/res/sprites.h
@@ -22,10 +22,12 @@
 
 */
 
+#include "../src/sprite.h"
 
 /* Bank of tiles. */
 #define spritesBank 0
 /* Start of tile array. */
 extern unsigned char sprites[];
+extern SpriteCorners sprite_offsets[];
 
 /* End of SPRITES.H */
diff --git a/src/main.c b/src/main.c
index b7a8887..e154213 100644
--- a/src/main.c
+++ b/src/main.c
@@ -36,6 +36,7 @@ void main(void)
 	sprite.vel.y = 0;
 	sprite.acc.x = 0;
 	sprite.acc.y = 0;
+	sprite.collision_offset = sprite_offsets[0];
 	move_sprite(0, sprite.pos.x, sprite.pos.y);
 
 
diff --git a/src/sprite.c b/src/sprite.c
index 0397c70..504dd46 100644
--- a/src/sprite.c
+++ b/src/sprite.c
@@ -6,16 +6,6 @@
 #include "./map.h"
 
 
-typedef struct Sprites {
-	int frames_since_last_dash;
-	int frames_since_last_jump;
-	int size;
-	UVec pos;
-	Vec vel;
-	Vec acc;
-} Sprite;
-
-
 typedef struct SpriteCorners {
 	UVec itl;
 	UVec itr;
@@ -24,6 +14,16 @@ typedef struct SpriteCorners {
 } SpriteCorners;
 
 
+typedef struct Sprites {
+	int frames_since_last_dash;
+	int frames_since_last_jump;
+	SpriteCorners collision_offset;
+	UVec pos;
+	Vec vel;
+	Vec acc;
+} Sprite;
+
+
 int get_tile_index_by_coord(unsigned int x, unsigned int y);
 void getSpriteCorners(Sprite *sprite, SpriteCorners *r);
 void sprite_iter_frame(Sprite *sprite, Map *map, int joypad, unsigned int *fc);
@@ -39,14 +39,14 @@ int get_tile_index_by_coord(unsigned int x, unsigned int y)
 
 void getSpriteCorners(Sprite *sprite, SpriteCorners *sc)
 {
-	sc->itl.x = sprite->pos.x-8;
-	sc->itl.y = sprite->pos.y-16;
-	sc->itr.x = sprite->pos.x-1;
-	sc->itr.y = sprite->pos.y-16;
-	sc->ibl.x = sprite->pos.x-8;
-	sc->ibl.y = sprite->pos.y-9 ;
-	sc->ibr.x = sprite->pos.x-1;
-	sc->ibr.y = sprite->pos.y-9;
+	sc->itl.x = sprite->pos.x - sprite->collision_offset.itl.x;
+	sc->itl.y = sprite->pos.y - sprite->collision_offset.itl.y - 8;
+	sc->itr.x = sprite->pos.x - sprite->collision_offset.itr.x;
+	sc->itr.y = sprite->pos.y - sprite->collision_offset.itr.y - 8;
+	sc->ibl.x = sprite->pos.x - sprite->collision_offset.ibl.x;
+	sc->ibl.y = sprite->pos.y - sprite->collision_offset.ibl.y - 8;
+	sc->ibr.x = sprite->pos.x - sprite->collision_offset.ibr.x;
+	sc->ibr.y = sprite->pos.y - sprite->collision_offset.ibr.y - 8;
 }
 
 
diff --git a/src/sprite.h b/src/sprite.h
index 46fa765..7285059 100644
--- a/src/sprite.h
+++ b/src/sprite.h
@@ -4,10 +4,17 @@
 #include "./vec.h"
 #include "./map.h"
 
+typedef struct SpriteCorners {
+	UVec itl;
+	UVec itr;
+	UVec ibl;
+	UVec ibr;
+} SpriteCorners;
+
 typedef struct Sprites {
 	int frames_since_last_dash;
 	int frames_since_last_jump;
-	int size;
+	SpriteCorners collision_offset;
 	UVec pos;
 	Vec vel;
 	Vec acc;