One new board every day, the same board for everyone.
Drag a piece from the rack onto the lit board. Green means it fits, red means it does not.
Rotate and mirror while you hold a piece until it slots in.
Fill every lit cell. Dark gaps in the outline are walls — nothing goes there.
Q / ERotate the held pieceFMirror the held pieceZUndo the last moveEscDrop the held piece back in the rackClickOn desktop, a single click carries a piece until you click againTapOn a phone, tap a piece to pick it, rotate it, then tap a cell to drop itTop viewFlattens the board to a plain grid — easier to read on a small screen
Dragging works everywhere. On touch the piece rides above your
fingertip so you can see where it is going.
The tray grows through the week: Monday hands you four pieces, Sunday hands you the whole board.