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Epicycles

Rotations · 30 levels

Spin circles on circles to draw the target shape.

How to play

1. Each circle spins around the tip of the one before. Give every circle a size card and a spin card, then tap Draw.
2. Spin +2 turns twice per lap anticlockwise ↺, −1 once clockwise ↻. The pen on the last tip draws the curve.
3. Match the faint target. Its reach is the sum of the sizes; it repeats after a 1/m turn, where m is the gap between the spins (+1 and −3 → 4).

With three circles the symmetry number is the biggest number that divides every gap between spins. Swapping two whole circles never changes the drawing.

Open Epicycles

Teeter, Tint and Echo Heist are free starters. Other games unlock through earned game choices or permanent packs. Your progress stays in the browser; optional sign-in saves it to your website account.