Any palm OS hardware
Palm OS 3.5

This is the illigitiment sequel to Space Invaders.

Just when you thought you pushed back those pesky invaders in the 1980's, a recent scan has found them trying to establish a lunar foothold for their next invasion.

Fortunately, Earth was able to install a missle defence system on the surface before they could start landing.

Control the missile Defender and blast the Moon Intruders, and prevent them from reaching the surface!

Update Description:

- Added the ability to change the key map (for Zire 21 and Zire 31 users).