Use the keyboard A, W, D, S or arrow keys Left, Up, Right, Down, and mouse button - if the game description "Dots and Boxes" is not stated otherwise.
Dots and Boxes
Description: Classic pencil and paper game. Add a single line (vertical or horizontal) between 2 dots. If you complete a 1x1 box you earn a point and get another turn. The winner is the player with the most points (boxes).