To start a one- player game, simply click the green flag. For a Two- player game, hit the p key If you want to speed the ball ( or other object, such as frog) hold Z Arrow keys for player one, WASD for player 2 Space to change subject O for walls (note: bad physics with this, so investigate as you please) The 2 key will change the direction of the subject (ball) by a slight amount. This could prove helpful when it bounces across the sides of the screen horizontally. After you start a game using p or the green flag, move your mouse around the stage. The color should change with the mouse position. Find the color you want to use, and click to begin. If you add walls before selecting your color, they will also fit the color scheme. If you want to toggle easy mode, use the S or down arrow key Enjoy!