Detailed instructions are in the game; just click the "Game Manual" tab. Read below if you just want to know how to . play You control the Earth. Click and drag your mouse to move the Earth, or use the WASD keys to move slowly. Click and hold to shoot. Your score is based on how long you survive and how many planets you shoot down. Try using fullscreen mode! Standard Mode is the modern version of the game. You can shoot planets, damage them by running into them, collect power-ups, use the WASD keys, and you slowly recover health over time. When you die, on the right the worldwide high score will show. Challenge Mode is the classic version which is similar to the first game. You can't damage any planets or collect power-ups, and you can't use the WASD keys or recover health over time.
