diff --git a/Toy b/Toy
index e9b347a..1064b69 160000
--- a/Toy
+++ b/Toy
@@ -1 +1 @@
-Subproject commit e9b347acb68914a05707f1388d18d645b0a18515
+Subproject commit 1064b69d04aed5e5bb95ce5670a2def8b6d30c6a
diff --git a/assets/scripts/tilemap/layer-background.toy b/assets/scripts/tilemap/layer-background.toy
index 585adb5..16c0d6e 100644
--- a/assets/scripts/tilemap/layer-background.toy
+++ b/assets/scripts/tilemap/layer-background.toy
@@ -1,4 +1,5 @@
 //this is one layer
+import standard;
 import node;
 
 var childCounter: int = 0;
@@ -10,6 +11,9 @@ var tileHeight: float const = 100;
 var roomWidth: float const = 10;
 var roomHeight: float const = 10;
 
+var levelXCount: int const = 4;
+var levelYCount: int const = 4;
+
 
 //util to generate and init a child node of a given parent
 fn makeChildSprite(parent: opaque, spriteName: string) {
@@ -31,22 +35,37 @@ fn onInit(node: opaque) {
 	node.makeChildSprite("tile-background.png");
 }
 
-fn drawRoom(node: opaque, x, y, depth, camX, camY, camW, camH) {
-	//the modifier ratio to move things
+
+fn drawLayer(node: opaque, camX, camY, camW, camH, depth) {
+	//calc the modifier ratio to offset things
 	var mod: float = float tileWidth / (tileWidth - depth);
 	
-	var tileWidth_mod = tileWidth * mod;
-	var tileHeight_mod = tileHeight * mod;
+	var tileWidth_mod = round(tileWidth * mod);
+	var tileHeight_mod = round(tileHeight * mod);
 	var camX_mod = (camX - camW) * mod + camW / 2;
 	var camY_mod = (camY - camH) * mod + camH / 2;
 
-	for (var j: int = 0; j < roomHeight; j++) {
-		for (var i: int = 0; i < roomWidth; i++) {
-			node.getNodeChild(0).drawNode(round( (x * roomWidth + i) * tileWidth_mod + camX_mod ),round( (y * roomHeight + j) * tileHeight_mod + camY_mod ), round( tileWidth_mod ), round( tileHeight_mod ));
+	//calc the region to render
+	var lowerX = round((camX - camW/2) / tileWidth);
+	var upperX = round((camX - camW*1.5) / tileWidth);
+	var lowerY = round((camY - camH/2) / tileHeight);
+	var upperY = round((camY - camH*1.5) / tileHeight);
+
+	//bounds check
+	lowerX = max(0, abs(lowerX));
+	upperX = min(upperX < 0 ? abs(upperX) : 0, levelXCount * roomWidth);
+	lowerY = max(0, abs(lowerY));
+	upperY = min(upperY < 0 ? abs(upperY) : 0, levelYCount * roomHeight);
+
+	//render each tile
+	for (var j = lowerY; j <= upperY; j++) {
+		for (var i = lowerX; i <= upperX; i++) {
+			node.getNodeChild(0).drawNode(round(camX_mod + i * tileWidth_mod), round(camY_mod + j * tileHeight_mod), tileWidth_mod, tileHeight_mod);
 		}
 	}
 }
 
+//math utils
 fn round(x): int {
 	var f = floor(x);
 	return x - f >= 0.5 ? f + 1 : f;
diff --git a/assets/scripts/tilemap/layer-walls.toy b/assets/scripts/tilemap/layer-walls.toy
index 47404a7..9262ac1 100644
--- a/assets/scripts/tilemap/layer-walls.toy
+++ b/assets/scripts/tilemap/layer-walls.toy
@@ -1,4 +1,5 @@
 //this is one layer
+import standard;
 import node;
 
 var childCounter: int = 0;
@@ -10,6 +11,9 @@ var tileHeight: float const = 100;
 var roomWidth: float const = 10;
 var roomHeight: float const = 10;
 
+var levelXCount: int const = 4;
+var levelYCount: int const = 4;
+
 
 //util to generate and init a child node of a given parent
 fn makeChildSprite(parent: opaque, spriteName: string) {
@@ -31,36 +35,42 @@ fn onInit(node: opaque) {
 	node.makeChildSprite("tile-wall.png");
 }
 
-//draw the parallax-style walls
-fn drawRoom(node: opaque, x, y, depth, camX, camY, camW, camH) {
-	var mod: float = float tileWidth / (tileWidth - depth);
 
-	var tileWidth_mod = tileWidth * mod;
-	var tileHeight_mod = tileHeight * mod;
+fn drawLayer(node: opaque, camX, camY, camW, camH, depth) {
+	//calc the modifier ratio to offset things
+	var mod: float = float tileWidth / (tileWidth - depth);
+	
+	var tileWidth_mod = round(tileWidth * mod);
+	var tileHeight_mod = round(tileHeight * mod);
 	var camX_mod = (camX - camW) * mod + camW / 2;
 	var camY_mod = (camY - camH) * mod + camH / 2;
 
-	//top
-	for (var i = x * roomWidth; i < (x * roomWidth) + roomWidth; i++) {
-		node.getNodeChild(0).drawNode(round( i * tileWidth_mod + camX_mod ), round(y * roomHeight * tileHeight_mod + camY_mod ), round( tileWidth_mod), round( tileHeight_mod ));
-	}
+	//calc the region to render
+	var lowerX = round((camX - camW/2) / tileWidth);
+	var upperX = round((camX - camW*1.5) / tileWidth);
+	var lowerY = round((camY - camH/2) / tileHeight);
+	var upperY = round((camY - camH*1.5) / tileHeight);
 
-	//left
-	for (var j = y * roomHeight; j < (y * roomHeight) + roomHeight; j++) {
-		node.getNodeChild(0).drawNode(round( x * roomWidth * tileWidth_mod + camX_mod ), round( j * tileHeight_mod + camY_mod ), round( tileWidth_mod), round( tileHeight_mod ));
-	}
+	//bounds check
+	lowerX = max(0, abs(lowerX));
+	upperX = min(upperX < 0 ? abs(upperX) : 0, levelXCount * roomWidth);
+	lowerY = max(0, abs(lowerY));
+	upperY = min(upperY < 0 ? abs(upperY) : 0, levelYCount * roomHeight);
 
-	//bottom
-	for (var i = x * roomWidth; i < (x * roomWidth) + roomWidth; i++) {
-		node.getNodeChild(0).drawNode(round( i * tileWidth_mod + camX_mod), round( ((y+1) * roomHeight -1) * tileHeight_mod + camY_mod), round( tileWidth_mod), round( tileHeight_mod));
-	}
+	//render each tile
+	for (var j = lowerY; j <= upperY; j++) {
+		for (var i = lowerX; i <= upperX; i++) {
+			if ( !(int i % int roomWidth == 0 || int i % int roomWidth == roomWidth - 1) && !(int j % int roomHeight == 0 || int j % int roomHeight == roomHeight - 1) ) {
+				continue;
+			}
 
-	//right
-	for (var j = y * roomHeight; j < (y * roomHeight) + roomHeight; j++) {
-		node.getNodeChild(0).drawNode(round( ((x + 1) * roomWidth -1) * tileWidth_mod + camX_mod ), round( j * tileHeight_mod + camY_mod ), round( tileWidth_mod ), round( tileHeight_mod ));
+			node.getNodeChild(0).drawNode(round(camX_mod + i * tileWidth_mod), round(camY_mod + j * tileHeight_mod), tileWidth_mod, tileHeight_mod);
+		}
 	}
 }
 
+
+//math utils
 fn round(x): int {
 	var f = floor(x);
 	return x - f >= 0.5 ? f + 1 : f;
diff --git a/assets/scripts/tilemap/tilemap.toy b/assets/scripts/tilemap/tilemap.toy
index d6b6e16..0c7876f 100644
--- a/assets/scripts/tilemap/tilemap.toy
+++ b/assets/scripts/tilemap/tilemap.toy
@@ -47,31 +47,13 @@ fn onDraw(node: opaque) {
 	print stepCounter;
 	stepCounter = 0;
 
-	//TODO: reference the camera width & height
-	//TODO: render parallax
-
-	//cull out-of-bounds regions
-	var lowerX = abs(floor(floor((camX-screenWidth/2) / tileWidth) / float roomWidth));
-	var upperX = abs(ceil(floor((camX-screenWidth*1.5) / float tileWidth) / float roomWidth));
-
-	var lowerY = abs(floor(floor((camY-screenHeight/2) / tileHeight) / float roomHeight));
-	var upperY = abs(ceil(floor((camY-screenHeight*1.5) / float tileHeight) / float roomHeight));
-
-	//bounds check
-	lowerX = max(lowerX, 0);
-	upperX = min(upperX + 1, levelXCount);
-	lowerY = max(lowerY, 0);
-	upperY = min(upperY + 1, levelYCount);
-
+	//iterate over each layer, passing in the screen dimensions
 	for (var c = 0; c < childCounter; c++) {
-		for (var j = lowerY; j <= upperY; j++) {
-			for (var i = lowerX; i <= upperX; i++) {
-				node.getNodeChild(c).callNodeFn("drawRoom", i, j, c * 4.0, camX, camY, screenWidth, screenHeight);
-			}
-		}
+		node.getNodeChild(c).callNodeFn("drawLayer", camX, camY, screenWidth, screenHeight, c * 2);
 	}
 }
 
+//math utils
 fn round(x): int {
 	var f = floor(x);
 	return x - f >= 0.5 ? f + 1 : f;