Cobbled together by a Japanese company called Taito around 1978, this is the ultimate in retro gaming. The graphics are certainly nothing to write home about - you'd be stupid to even consider it. Yet back in the day, this was cutting-edge technology. Space-age, even.

You control the laser base (a pointy green blob) and have to defend your planet (a green line) from those nasty space invaders (the white, moving blobs). Yes, there are a lot of blobs, but the gameplay more than makes up for that. Now ask yourself... can you beat the high score?
 

To Play the Game: 

You can move the laser base using these controls on the keyboard: 
Space Bar = Fire laser
Left Arrow = Move left
Right Arrow = Move right

If you hit the UFO, you're rewarded with a "mystery" bonus score. It's game over after 3 lives, or if the invaders overrun the barracks. And you only get one shot at a time, so make sure you hit that target!