◀ ▶ — walk along the tower walls
▲ on a stair tile to climb · ▼ to descend
💎 Collect digit gems to reveal the volume (2–4 gems by difficulty)
📐 Count steps on each face → Width & Length
🚪 Exit unlocks once you have all 3 gems
🧮 At exit: enter W × L × H = V to complete!
⬡▱ Avoid guards — arrows show their next move!
✦ Power-ups: 👁 Vision 🌫 Cloak ⭐ Convert
Hints drop every minute showing gem locations 🗺️