1. The Pieces. Thirteen flat translucent pieces, each a disc with bumps and notches. Drag them from the tray into the frame.
2. The Objective. Return all 13 pieces into the tray so they lie completely flat — with no pieces overlapping and every piece fitting perfectly within the frame.
- Rotate a piece with a tap (or the R key) to turn it 60°.
- Flip a piece (F key or the Flip button) to mirror it — handy for the tail pieces.
- Every bump nests into a neighbour's notch until no gaps remain.