Play proceeds turn-about with each user able to draw a single side of a box per turn. If the player completes a box, they win the box and gain an extra line.
Play continues until all lines have been drawn and, therefore, all boxes won.
The winner is the player with the most boxes.
On your turn, simply trace your finger along the line you want to play.
1.1.0: Remembers preferences and better computer play
1.0.1: This release allows clicking on lines, as well as dragging, to speed up play
1.0.0: Initial release