Move your hands to push the red block. Clicking the dials at the top-left corner of the screen rotates the block. Pressing space resets the block. Note: The block can be moved by someone moving in the background or the camera being shaken. Also, moving your hands too fast won't cause the block to move.
How this project works is due to the video sensing blocks. When your hand moves across the block, your hand's movement is detected. It then responds and move in the direction you push.