Play it offline on your phone
One Line and 65 more games in the Mola app, even in airplane mode.

Fill every square with one line
From the start dot, draw one line without lifting your finger and fill every square of the board. The line goes from square to neighbouring square and never crosses itself. It looks easy; the trick is leaving no corner behind.

Fill every square in one line
One Line and 65 more games in the Mola app, even in airplane mode.