diff --git a/MystNB.g1a b/MystNB.g1a
index 369e357..ef54aee 100644
Binary files a/MystNB.g1a and b/MystNB.g1a differ
diff --git a/assets-fx/img/lv1.png b/assets-fx/img/lv1.png
new file mode 100644
index 0000000..4bdd166
Binary files /dev/null and b/assets-fx/img/lv1.png differ
diff --git a/assets-fx/map/lv1.txt b/assets-fx/map/lv1.txt
new file mode 100644
index 0000000..3de9215
--- /dev/null
+++ b/assets-fx/map/lv1.txt
@@ -0,0 +1,10 @@
+#####   #####
+#   #####   #
+#    a a    #
+##A### ###A##
+#    a a    #
+# ~ ##### @ #
+#####   #####
+
+a: #.
+A: #.
diff --git a/converters.py b/converters.py
new file mode 100644
index 0000000..b22244f
--- /dev/null
+++ b/converters.py
@@ -0,0 +1,89 @@
+import fxconv
+import re
+import os.path
+
+def convert(input, output, params, target):
+    if params["type"] == "map":
+        convert_map(input, output, params, target)
+    else:
+        raise fxconv.FxconvError(f"unknown conversion {params['type']}")
+        sys.exit(1)
+
+def convert_map(input, output, params, target):
+    TILE_AIR   = 0
+    TILE_WALL  = 1
+    TILE_START = 2
+    TILE_END   = 3
+    TILE_KEY   = 16
+    TILE_VDOOR = 24
+    TILE_HDOOR = 32
+
+    # Read input file
+
+    with open(input, "r") as fp:
+        tiles, cycles = fp.read().split("\n\n")
+        tiles = tiles.split("\n")
+        cycle_texts = [c for c in cycles.split("\n") if c]
+
+    w = max(len(t) for t in tiles)
+    h = len(tiles)
+    fog = 0
+
+    filename = os.path.splitext(os.path.basename(input))[0]
+
+    # Generate map contents
+
+    encoded_tiles = bytearray(w * h)
+    for (y, t) in enumerate(tiles):
+        for (x, c) in enumerate(t):
+            if c == " ":
+                tile = TILE_AIR
+            elif c == "#":
+                tile = TILE_WALL
+            elif c == "~":
+                tile = TILE_START
+            elif c == "@":
+                tile = TILE_END
+            elif ord("0") <= ord(c) <= ord("9"):
+                tile = TILE_KEY + int(c)
+            elif ord("a") <= ord(c) <= ord("z"):
+                tile = TILE_VDOOR + (ord(c) - ord("a"))
+            elif ord("A") <= ord(c) <= ord("Z"):
+                tile = TILE_HDOOR + (ord(c) - ord("A"))
+            else:
+                raise fxconv.FxconvError(f"unknown tile character {c}")
+
+            encoded_tiles[y*w + x] = tile
+
+    # Parse door cycles
+
+    RE_CYCLE = re.compile(r'^([a-zA-Z]):\s*([#.]+)$')
+    cycles = dict()
+
+    for c in cycle_texts:
+        m = re.match(RE_CYCLE, c)
+        if not m:
+            raise fxconv.FxconvError(f"cannot parse door cycle '{c}'")
+        cycles[m[1]] = m[2].encode("utf-8")
+
+    # Generate door cycle data
+
+    door_cycle = b""
+    door_cycle_index = bytearray(16)
+
+    for index, letter in enumerate("abcdefghABCDEFGH"):
+        door_cycle_index[index] = len(door_cycle)
+        if letter in cycles:
+            door_cycle += cycles[letter] + b" "
+
+    door_cycle = door_cycle + bytes(128 - len(door_cycle))
+
+    # Generate the structure
+
+    o = fxconv.ObjectData()
+    o += fxconv.u32(w) + fxconv.u32(h) + fxconv.u32(fog)
+    o += door_cycle + door_cycle_index
+    o += fxconv.ref(f"img_{filename}")
+    o += fxconv.ref(encoded_tiles)
+
+    fxconv.elf(o, output, "_" + params["name"], **target)
diff --git a/src/engine.c b/src/engine.c
index 0c79ea2..078dde3 100644
--- a/src/engine.c
+++ b/src/engine.c
@@ -40,6 +40,7 @@ static void engine_draw_player(struct player const *player)
 void engine_draw(struct game const *game)
 {
 	dclear(C_WHITE);
+	dimage(0, 0, game->map->img);
 
 	for(int p = 0; game->players[p]; p++)
 	{
@@ -54,8 +55,8 @@ void engine_draw(struct game const *game)
 /* Check whether a cell of the map is walkable */
 static int map_walkable(struct map const *map, int x, int y)
 {
-	/* TODO: Read the map's data array */
-	return (x >= 1) && (y >= 1) && (x < map->w - 1) && (y < map->h - 1);
+	int tile = map->tiles[y * map->w + x];
+	return (tile != TILE_WALL);
 }
 
 int engine_move(struct game *game, struct player *player, int dir)
diff --git a/src/engine.h b/src/engine.h
index 6e0393c..da7d5dd 100644
--- a/src/engine.h
+++ b/src/engine.h
@@ -37,8 +37,30 @@ struct map
 	int w, h;
 	/* Whether fog is enabled */
 	int fog;
-	/* Raw data */
-	uint8_t *data;
+	/* Door cycle string */
+	char door_cycle[128];
+	/* Mapping of door types to cycle string index */
+	uint8_t door_cycle_index[16];
+	/* Background image */
+	bopti_image_t *img;
+	/* Array of tiles in row-major order */
+	uint8_t *tiles;
+};
+
+/* enum map_tile: Single cell in the map */
+enum map_tile
+{
+	TILE_AIR   = 0,
+	TILE_WALL  = 1,
+	TILE_START = 2,
+	TILE_END   = 3,
+
+	/* 8 keys in interval 16..23 */
+	TILE_KEY   = 16,
+	/* 8 vertical doors in interval 24..31 */
+	TILE_VDOOR = 24,
+	/* 8 horizontal doors in interval 32..39 */
+	TILE_HDOOR = 32,
 };
 
 /* struct game: A running game with a map and some players */
diff --git a/src/main.c b/src/main.c
index c214b3c..2372d0b 100644
--- a/src/main.c
+++ b/src/main.c
@@ -97,12 +97,10 @@ int main(void)
 	};
 	singleplayer.idle = !anim_player_idle(&singleplayer.anim, 1);
 
-	struct map map = {
-		.w = 13,
-		.h = 7
-	};
+	extern struct map map_lv1;
+
 	struct game game = {
-		.map = &map,
+		.map = &map_lv1,
 		.players = { &singleplayer, NULL },
 		.time = 0,
 	};