The basic rule
Pour the top layer of one jar into another; heavy sinks through light.
Controls
Desktop
- Mouse to aim, click to play.
- Arrow keys for fine control.
- Undo is always available — no penalty.
Mobile & touch
- Swipe or drag to aim.
- Tap to confirm.
- Vibration feedback on successful moves.
Tips for beginners
- Think two moves ahead — the board only gets harder.
- Undo is free — use it to explore strategies.
- There is no timer, so take your time.