"The First Invasion" is at heart a simple space invaders clone, it's not a direct recreation of any particular version of space invaders but instead a collection of space invaders games. For the main release it has 6 different game modes plus a two player mode, the free version available below has just three game modes. The game can be thought of as an interactive history of space invaders provided on a single SEGA Megadrive / Genesis cartridge.