What counts as a gap?

An empty cell whose neighbours, including diagonals, are all filled or off the board.

When does the tidy bonus apply?

After a move, if no gaps are left on the board, the cells of the piece you placed score again.

Yes, on this device only. Nothing is sent anywhere.

Fit pieces and clear lines, but keep the board free of one-cell gaps. While it has none, every piece you place scores double.

Zero Gap

0% · Getting ready

A real run of the game, recorded with captions and no sound.

Pick one of the three pieces under the board, then tap a cell to set it down.
A gap is an empty cell with filled cells on every side. While the board has no gaps, the cells of each piece you place score double.
Fill a whole row or column to clear it. Clearing lines also removes gaps in them.
When none of the pieces left in your hand fit anywhere, the game ends. Your best score is saved on this device.

Controls: mouse, touch or keyboard. Made by CalcoTools.

Look at the cells around the piece before you set it down. A fit that traps one empty cell costs the doubling.
Place pieces edge to edge. Pieces that leave a single empty cell next to a wall are the usual culprit.
A line clear is the cure for a gap, so aim for one when you are stuck with one.
A one-cell piece can fill a gap and bring the doubling back.

What counts as a gap?: An empty cell whose neighbours, including diagonals, are all filled or off the board.
When does the tidy bonus apply?: After a move, if no gaps are left on the board, the cells of the piece you placed score again.
Is my best score saved?: Yes, on this device only. Nothing is sent anywhere.