Hang paper ornaments on a wooden mobile until every beam floats perfectly level.
HOW IT WORKS
1. Every ornament shows its weight. Every hook shows its distance from the beam's string.
2. A beam hangs level when weight × distance on the left equals weight × distance on the right. A 2 at distance 4 balances a 4 at distance 2.
3. A beam hanging from another beam counts as one ornament whose weight is everything below it added up.
4. Hang an ornament on every hook so that all beams are level. Spare ornaments may stay in the tray.
The mobile tilts as you work — the low side is too heavy — so you can feel the answer long before you finish the arithmetic.
- 60 verified puzzles, each with exactly one solution
- Five chapters that add one new idea at a time, from a single beam to deeply nested tiers
- No timers, no ads, no energy, no subscriptions
- Gentle hints that reveal one ornament, never the whole board
- Three short interactive lessons instead of a wall of instructions
- Generative wind-chime music and a quiet paper-and-starlight look
- Touch, mouse, and full keyboard control
- English and Polish
The first 15 levels are free. One purchase unlocks all 60 forever — no subscription, and nothing else to buy.
A calm logic puzzle: balance paper mobiles by weight and distance.