Drag, turn, flip.
Drag a piece from the tray onto the board and it snaps to the squares, with an outline showing where it will land. Tap it to give it a quarter turn; the flip button mirrors it.
- Drag a piece off the board to take it back. Reset sends every piece home.
- Drop a piece where it can't fit and it shakes, then slides back to the tray.
- Every piece carries its letter, so colour is never the only clue.

