diff --git a/README.md b/README.md
index 83a3065..b1add73 100644
--- a/README.md
+++ b/README.md
@@ -34,9 +34,9 @@ I have mostly solved parsing of SNES menus in a sister project, however there ar
 - [ ] Vehicle sprites (solved problem, soon™)
 #### World Maps (Fields?)
 - [x] Tiles
-- [ ] Tilemaps (solved problem, soon™)
+- [x] Tilemaps
 - [ ] Dynamic changes (e.g. meteors, breaking seals, sinking island, pirate cave, voids) (might hardcode these later)
-- [ ] Pathing (I have vague recollections about this)
+- [ ] Pathing (Data is in place, just needs moving around with collisions)
 - [ ] Mode 7 Effects (...might hardcode these later)
 #### Dungeon/Town/Zone Maps (idk what accepted terminology is)
 - [ ] Tiles (solved problem, soon™)
diff --git a/scripts/loaders/map_loader.gd b/scripts/loaders/map_loader.gd
index 910d343..59c3eb5 100644
--- a/scripts/loaders/map_loader.gd
+++ b/scripts/loaders/map_loader.gd
@@ -89,7 +89,7 @@ class WorldMap:
 				data[y_off + x_off + 1] = self.block_tile_ids[tile_offset+1]
 				data[y_off + tile_width + x_off] = self.block_tile_ids[tile_offset+2]
 				data[y_off + tile_width + x_off + 1] = self.block_tile_ids[tile_offset+3]
-		image.create_from_data(tile_width, tile_height, false, Image.FORMAT_R8, data)
+		image.create_from_data(tile_width, tile_height, false, SpriteLoader.INDEX_FORMAT, data)
 		return image
 
 var worldmaps = [WorldMap.new(), WorldMap.new(), WorldMap.new(), WorldMap.new(), WorldMap.new()]
@@ -135,6 +135,7 @@ func load_worldmaps(rom: File):
 			rom.seek(chunk_addresses[chunk_id])
 			var chunk_size := 0
 			while chunk_size < 256:
+				# var b: int = (blockmap.size() % 16) + (16 * (chunk_id % 12));  # For debugging the map shader against blocks
 				var b := rom.get_8()
 				if b >= 0xC0:  # RLE
 					var count := b-0xBF
diff --git a/scripts/loaders/sprite_loader.gd b/scripts/loaders/sprite_loader.gd
index 64f0d21..f67f280 100644
--- a/scripts/loaders/sprite_loader.gd
+++ b/scripts/loaders/sprite_loader.gd
@@ -2,6 +2,10 @@ extends Node
 
 var shader_material = load('res://palette_mat.tres')
 
+# Portability for GLES2 vs GLES3 stuff
+const INDEX_FORMAT := Image.FORMAT_L8
+
+
 # Offsets
 
 # Glyphs
@@ -122,13 +126,13 @@ func gba_4bpp_to_tile(data: PoolByteArray) -> Image:
 		tdata[i*2] = data[i] % 16
 		tdata[i*2+1] = data[i] / 16
 	var tile := Image.new()
-	tile.create_from_data(8, 8, false, Image.FORMAT_R8, tdata)
+	tile.create_from_data(8, 8, false, INDEX_FORMAT, tdata)
 	return tile
 
 func snes_mode7_to_tile(data: PoolByteArray) -> Image:
 	# Easy one, it's just straight data left-to-right, top-to-bottom
 	var tile := Image.new()
-	tile.create_from_data(8, 8, false, Image.FORMAT_R8, data)
+	tile.create_from_data(8, 8, false, INDEX_FORMAT, data)
 	return tile
 
 func snes_mode7_compressed_to_tile(data: PoolByteArray, tile_palette: int = 0) -> Image:
@@ -148,7 +152,7 @@ func snes_4plane_to_tile(data: PoolByteArray) -> Image:
 		var x = 7 - (i%8)
 		tdata[i] = (data[j] >> x & 1) | ((data[j+1] >> x & 1)<<1) | ((data[j+16] >> x & 1)<<2) | ((data[j+17] >> x & 1)<<3)
 	var tile := Image.new()
-	tile.create_from_data(8, 8, false, Image.FORMAT_R8, tdata)
+	tile.create_from_data(8, 8, false, INDEX_FORMAT, tdata)
 	return tile
 
 func snes_3plane_to_tile(data: PoolByteArray) -> Image:
@@ -158,7 +162,7 @@ func snes_3plane_to_tile(data: PoolByteArray) -> Image:
 		var x = 7 - (i%8)
 		tdata[i] = (data[j] >> x & 1) | ((data[j+1] >> x & 1)<<1) | ((data[(i/8)+16] >> x & 1)<<2)
 	var tile := Image.new()
-	tile.create_from_data(8, 8, false, Image.FORMAT_R8, tdata)
+	tile.create_from_data(8, 8, false, INDEX_FORMAT, tdata)
 	return tile
 
 func snes_2plane_to_tile(data: PoolByteArray) -> Image:
@@ -168,7 +172,7 @@ func snes_2plane_to_tile(data: PoolByteArray) -> Image:
 		var x = 7 - (i%8)
 		tdata[i] = (data[j] >> x & 1) | ((data[j+1] >> x & 1)<<1)
 	var tile := Image.new()
-	tile.create_from_data(8, 8, false, Image.FORMAT_R8, tdata)
+	tile.create_from_data(8, 8, false, INDEX_FORMAT, tdata)
 	return tile
 
 func snes_1plane_to_tile(data: PoolByteArray) -> Image:
@@ -177,7 +181,7 @@ func snes_1plane_to_tile(data: PoolByteArray) -> Image:
 		var x = 7 - (i%8)
 		tdata[i] = (data[i/8] >> x & 1)
 	var tile := Image.new()
-	tile.create_from_data(8, 8, false, Image.FORMAT_R8, tdata)
+	tile.create_from_data(8, 8, false, INDEX_FORMAT, tdata)
 	return tile
 
 func snes_get_tile(rom: File, offset: int, length: int) -> Image:
@@ -198,7 +202,7 @@ func snes_get_tile(rom: File, offset: int, length: int) -> Image:
 func make_tile_atlas(tile_images) -> Image:
 	var r := Rect2(0, 0, 8, 8)
 	var image = Image.new()
-	image.create(128, 128, false, Image.FORMAT_R8)
+	image.create(128, 128, false, INDEX_FORMAT)
 	var tile = 0
 	for y in tile_images.size()/16:
 		for x in 16:
@@ -240,7 +244,7 @@ func snes_load_worldmap(rom: File):
 		var block_tile_ids := PoolByteArray()
 		for block in 0xC0:  # 192 blocks per world tileset
 			image = Image.new()
-			image.create(16, 16, false, Image.FORMAT_R8)
+			image.create(16, 16, false, INDEX_FORMAT)
 			for tile in 4:
 				rom.seek(block_bank_start + block + (tile * 0xC0))  # Horrible interleaving scheme
 				var src_idx := rom.get_8()
@@ -254,7 +258,7 @@ func snes_load_worldmap(rom: File):
 		worldmap_block_tile_ids.append(block_tile_ids)
 		# Make block atlas
 		image = Image.new()
-		image.create(16*16, 16*12, false, Image.FORMAT_R8)
+		image.create(16*16, 16*12, false, INDEX_FORMAT)
 		for block in 0xC0:
 			image.blit_rect(block_images[block], Rect2(0, 0, 16, 16), Vector2((block%16)*16, (block/16)*16))
 		worldmap_block_atlas_imgs.append(image)
@@ -262,7 +266,7 @@ func snes_load_worldmap(rom: File):
 
 		# # DEBUG: Make tile atlas
 		# image = Image.new()
-		# image.create(16*8, (tile_count/16)*8, false, Image.FORMAT_R8)
+		# image.create(16*8, (tile_count/16)*8, false, INDEX_FORMAT)
 		# for tile in tile_count:
 		# 	image.blit_rect(tile_images[tile], Rect2(0, 0, 8, 8), Vector2((tile%16)*8, (tile/16)*8))
 		# worldmap_tile_atlas_textures.append(texture_from_image(image))
@@ -280,7 +284,7 @@ func load_snes_rom(rom: File):
 		for i in range(0, 32*48, 32):
 			tiles.append(snes_get_tile(rom, offset_Character_Battle_Sprite_Tiles + (strip*32*48) + i, 32))
 		var strip_image = Image.new()
-		strip_image.create(16, 24 * num_Character_Battle_Sprite_Layouts, false, Image.FORMAT_R8)
+		strip_image.create(16, 24 * num_Character_Battle_Sprite_Layouts, false, INDEX_FORMAT)
 		for i in range(6 * num_Character_Battle_Sprite_Layouts):
 			strip_image.blit_rect(tiles[battle_strip_layouts[i]], Rect2(0, 0, 8, 8), Vector2((i%2) * 8, (i/2) * 8))
 		strip_images.append(strip_image)
@@ -334,7 +338,7 @@ func load_gba_rom(filename: String):
 		for i in range(8, 57*32+8, 32):
 			tiles.append(gba_4bpp_to_tile(tiledata.subarray(i, i+32)))
 		var strip_image = Image.new()
-		strip_image.create(16, 24 * num_Character_Battle_Sprite_Layouts, false, Image.FORMAT_R8)
+		strip_image.create(16, 24 * num_Character_Battle_Sprite_Layouts, false, INDEX_FORMAT)
 		for i in range(6 * num_Character_Battle_Sprite_Layouts):
 			strip_image.blit_rect(tiles[battle_strip_layouts[i]], Rect2(0, 0, 8, 8), Vector2((i%2) * 8, (i/2) * 8))
 		strip_images.append(strip_image)
diff --git a/shaders/palette_shader.gdshader b/shaders/palette_shader.gdshader
index 096abfb..e897c9e 100644
--- a/shaders/palette_shader.gdshader
+++ b/shaders/palette_shader.gdshader
@@ -10,10 +10,9 @@ void fragment() {
 	if (color_idx == uint(0))
 		COLOR.a = 0.0;*/
 	// GLES2
-	float color_idx = texture(TEXTURE, UV).a * index_scale;
-	float row = trunc(color_idx) / 16.0;
-	float col = fract(color_idx);
+	float color_idx16 = texture(TEXTURE, UV).r * index_scale;
+	float row = trunc(color_idx16) / 16.0;
+	float col = fract(color_idx16);
 	COLOR = texture(palette, vec2(col, row));
-	if (color_idx == 0.0)
-		COLOR.a = 0.0;
+	COLOR.a = step(0.000001, color_idx16);  // Branchless transparency
 }
diff --git a/shaders/worldmap_shader.gdshader b/shaders/worldmap_shader.gdshader
index 7e34eaf..8184cd7 100644
--- a/shaders/worldmap_shader.gdshader
+++ b/shaders/worldmap_shader.gdshader
@@ -15,33 +15,28 @@ vec2 get_tile_atlas_uv(float tile_id, vec2 uv) {
 	float tile_row = trunc(tile_idx16) / 16.0;
 	float tile_col = fract(tile_idx16);
 	vec2 tile_uv = vec2(tile_col, tile_row);  // Convert 15.9375 to vec2(0.9375==15/16, (15)/16), this should result in integer coordinates in [0,15] scaled to [0,15/16] for UV
-	vec2 sub_tile_uv = fract(uv * tilemap_width);
+	vec2 sub_tile_uv = fract(uv * tilemap_width) / 16.0;
 
 	// TODO: add sea HScroll, waterfall VScroll tile UV modulation
-	return tile_uv + (sub_tile_uv/16.0);
+	return tile_uv + sub_tile_uv;
+	// return sub_tile_uv + vec2(0.0, 0.5);
 }
 
 void fragment() {
 	// GLES2
-	float s = texture(TEXTURE, UV).a;
-	// float tile_idx = texture(TEXTURE, UV).a * index_scale;  // Rescale from [0.0, 1.0] to [0, 255] to [0, 15.9375 (15+15/16)]
-	// float tile_row = trunc(tile_idx) / 16.0;
-	// float tile_col = fract(tile_idx);
-	// vec2 tile_uv = vec2(tile_col, tile_row);  // Convert 15.9375 to vec2(0.9375==15/16, (15)/16), this should result in integer coordinates in [0,15] scaled to [0,15/16] for UV
-	// vec2 sub_tile_uv = vec2(0.5, 0.5);  //fract(UV * tilemap_width);
+	// vec2 uv_tile = trunc(UV * tilemap_width) / tilemap_width;
+	vec2 uv_tile = UV;
+	float s = texture(TEXTURE, uv_tile).r;
 
 	// TODO: move cycling palette to a sampler2DArray or sampler3D rather than rebinding
 
 	vec2 lut_uv = get_tile_atlas_uv(s, UV);
-	// vec2 lut_uv = tile_uv;
-	float color_id = texture(tile_atlas, lut_uv).a;
+	float color_id = texture(tile_atlas, lut_uv).r;
 	float color_idx16 = color_id * index_scale;
 	float pal_row = trunc(color_idx16) / 16.0;
 	float pal_col = fract(color_idx16);
 	vec2 palette_uv = vec2(pal_col, pal_row);
 	COLOR = texture(palette, palette_uv);
 
-	// if (color_idx16 == 0.0)
-	// 	COLOR.a = 0.0;
-	COLOR.a = 1.0;
+	COLOR.a = step(0.000001, color_idx16);  // Branchless transparency
 }
diff --git a/test/worldmap_system.gd b/test/worldmap_system.gd
index 8444260..e4bb408 100644
--- a/test/worldmap_system.gd
+++ b/test/worldmap_system.gd
@@ -54,6 +54,7 @@ func _create_worldmap_texrects() -> void:
 func _ready() -> void:
 	# Only create this after MapLoader and SpriteLoader have loaded!
 	_create_worldmap_texrects()
+	# _create_palette_and_atlas_texrects()
 
 
 # Called every frame. 'delta' is the elapsed time since the previous frame.
diff --git a/worldmap_palette_mat.tres b/worldmap_palette_mat.tres
index 2beb8e9..e472356 100644
--- a/worldmap_palette_mat.tres
+++ b/worldmap_palette_mat.tres
@@ -4,4 +4,4 @@
 
 [resource]
 shader = ExtResource( 1 )
-shader_param/tilemap_width = 256.0
+shader_param/tilemap_width = 512.0