If it doesn't work or key input is not working well, try changing to the Flash ActionScript2 emulator.
Adobe Flash Player is required. Check the flash player is installed, or Click the "Play by Flash Emulator" (latest browsers) checkbox above. Get Flash
Depending on the game, It may take some time to download.
Save the earth from the green aliens by shooting them with your solar cannon. Make sure you don't hit the humanoid space man in the process. There are various objects to contend with such as magnets, ice spikes, and various other barriers.
Use the mouse to aim and shoot. Hold down the mouse button for more power. Pass each level by hitting the alien and leaving the space man unscathed.
Progress to the next level after hitting the alien by clicking 'next level' at the bottom of the screen.
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