diff --git a/game.json b/game.json
index ff865d5..80fc522 100644
--- a/game.json
+++ b/game.json
@@ -3,7 +3,7 @@
   "start_room": 0,
   "intro_text": "Victoria, BC. 1979. You are Rob Wright, twenty-five, back from Calgary with a bass guitar and no plan. Your kid brother can really drum. The basement is free after laundry hours. (Right-click cycles verbs. Or just type.)",
   "max_score": 60,
-  "ego_sprite": "rob",
+  "ego_sprite": "rob-sheet2x3",
   "verbs": {
     "play": "jam riff shred strum drum",
     "listen": "hear"
diff --git a/sprites/rob-sheet2x3.png b/sprites/rob-sheet2x3.png
new file mode 100644
index 0000000..323e7b0
Binary files /dev/null and b/sprites/rob-sheet2x3.png differ
diff --git a/sprites/rob.png b/sprites/rob.png
deleted file mode 100644
index e58a09a..0000000
Binary files a/sprites/rob.png and /dev/null differ
diff --git a/tools/gen_sprites.py b/tools/gen_sprites.py
index 0bfe2cd..3b7fe0b 100755
--- a/tools/gen_sprites.py
+++ b/tools/gen_sprites.py
@@ -41,40 +41,116 @@ def write_png(path, rows, legend, scale=1):
 S = {}  # name -> (rows, legend)
 
 # --- people -------------------------------------------------------------
-# Rob Wright — the ego. Tall, calm, bass slung low. (Feet = bottom center.)
-S["rob"] = (
-    [
-        "....hhhh....",
-        "....hhhh....",
-        "....ffff....",
-        "....f2f2....",
-        "....ffff....",
-        ".....ff.....",
-        "...ssssss...",
-        "..ssssssss..",
-        "..s.ssss.s..",
-        "..s.ssss.s..",
-        "..b.ssss....",
-        ".bbbrssss...",
-        ".bb.ssss....",
-        "..b.pppp....",
-        "....pppp....",
-        "....p..p....",
-        "....p..p....",
-        "....p..p....",
-        "....p..p....",
-        "...oo..oo...",
-    ],
-    {
-        "h": (72, 52, 36),   # hair
-        "f": (214, 178, 148),# face
-        "2": (40, 40, 48),   # eyes
-        "s": (52, 56, 64),   # dark shirt
-        "p": (44, 48, 88),   # jeans
-        "o": (30, 30, 34),   # boots
-        "b": (150, 60, 40),  # bass body
-        "r": (220, 200, 160),# bass neck
-    },
+# Rob Wright — the ego, as an MRPCI sprite sheet (`-sheet2x3`): 2 walk
+# frames x 3 direction loops (front, back, side; the engine mirrors side
+# for right-facing). Every cel is exactly 12x20; feet = bottom center.
+ROB_LEGEND = {
+    "h": (72, 52, 36),   # hair
+    "f": (214, 178, 148),# face
+    "2": (40, 40, 48),   # eyes
+    "s": (52, 56, 64),   # dark shirt
+    "p": (44, 48, 88),   # jeans
+    "o": (30, 30, 34),   # boots / strap
+    "b": (150, 60, 40),  # bass body
+    "r": (220, 200, 160),# bass neck
+}
+
+ROB_FRONT0 = [
+    "....hhhh....",
+    "....hhhh....",
+    "....ffff....",
+    "....f2f2....",
+    "....ffff....",
+    ".....ff.....",
+    "...ssssss...",
+    "..ssssssss..",
+    "..s.ssss.s..",
+    "..s.ssss.s..",
+    "..b.ssss....",
+    ".bbbrssss...",
+    ".bb.ssss....",
+    "..b.pppp....",
+    "....pppp....",
+    "....p..p....",
+    "....p..p....",
+    "....p..p....",
+    "....p..p....",
+    "...oo..oo...",
+]
+# Frame 2: the walk bob — boots swing in.
+ROB_FRONT1 = ROB_FRONT0[:19] + ["....oo.oo..."]
+
+ROB_BACK0 = [
+    "....hhhh....",
+    "....hhhh....",
+    "....hhhh....",
+    "....hhhh....",
+    ".....ff.....",
+    "...ssssss...",
+    "..sossssss..",
+    "..s.osss.s..",
+    "..s.soss.s..",
+    "....ssos....",
+    "....ssso....",
+    "....sssso...",
+    "....ssss....",
+    "....pppp....",
+    "....pppp....",
+    "....p..p....",
+    "....p..p....",
+    "....p..p....",
+    "....p..p....",
+    "...oo..oo...",
+]
+ROB_BACK1 = ROB_BACK0[:19] + ["....oo.oo..."]
+
+# Side faces LEFT (MRPCI mirrors it for right); bass rides the front hip.
+ROB_SIDE0 = [
+    "....hhhh....",
+    "....hhhh....",
+    "....ffff....",
+    "....2fff....",
+    "....ffff....",
+    ".....ff.....",
+    "....ssss....",
+    "...ssssss...",
+    "...ssssss...",
+    "...ssssss...",
+    "..brssss....",
+    ".rbbssss....",
+    "..b.ssss....",
+    "....pppp....",
+    "....pppp....",
+    "....pp......",
+    "....pp......",
+    "....pp......",
+    "....pp......",
+    "...oooo.....",
+]
+ROB_SIDE1 = ROB_SIDE0[:15] + [
+    "...p..p.....",
+    "...p..p.....",
+    "..p....p....",
+    "..p....p....",
+    ".oo....oo...",
+]
+
+
+def sheet(*loops):
+    """Stack loops vertically, frames horizontally — the -sheetCxR layout."""
+    rows = []
+    for cels in loops:
+        for cel in cels:
+            assert len(cel) == len(cels[0]), "frames in a loop must share height"
+            assert all(len(r) == len(cel[0]) for r in cel), "cels must be rectangular"
+        for y in range(len(cels[0])):
+            rows.append("".join(c[y] for c in cels))
+    return rows
+
+
+S["rob-sheet2x3"] = (
+    sheet([ROB_FRONT0, ROB_FRONT1], [ROB_BACK0, ROB_BACK1], [ROB_SIDE0, ROB_SIDE1]),
+    ROB_LEGEND,
 )
 
 # John Wright — behind the kit or beside it; sticks in hand.