Click the green flag three times to start. First, click the circle or the line, then pick the snail, the snake, or the stone. The snail is a line and a circle, the snake is two lines, and the stone is two circles. You are trying to guess what the other person's pick is.
All by me. Idea by me and a school friend. After someone wins, click the green flag. It's a little bit glitchy on the win.