Click to place a shape. Use the up and down arrow keys to change the shape. Use left and right arrow keys to rotate the shape. Use comma key and period key (fullstop) to change the color, or use the number keys to select the preset colors (0 = Red, 1 = Yellow, etc, etc). Press the "e" key to erase all of the shapes on the screen. Press or hold the "o" and "p" keys to change the opacity. Press space to toggle paint/stamp mode. Change the stamp size by pressing the "z" and "x" keys. Tip: Hold down multiple keys at once to make a crazy cool piece of abstract art! I like to hold down space, the period key (fullstop), the right or left arrow key, and left click on the mouse all at once! Try to make the coolest piece of art you can, using only these tools!