Alien Invasion

Alien Invasion is a fixed screen shoot 'em up based on Space Invaders but with some additions to the gameplay. There are twelve different invaders in the game including one that takes two hits to kill. The invaders have three different kinds of bombs: normal bombs that drop straight down, spinning bombs that drop diagonally, and homing bombs that seek out the player. A notable difference from Space Invaders is that the old shields are gone. Instead, the laser base has a built-in shield that can be activated for protection. The player starts out with two shields and gets new ones at the start of each new wave. The UFOs act as supply ships and will randomly drop power-ups that the player can catch. Power-ups include extra lives and shields, stopping the invaders from moving or dropping bombs, and movable rockets. There's also a power-up that makes the invaders invisible.

The game also comes with editors that allow the player to change sprites and wave formations.