Infestation is a 3D vector first person shooter and a action adventure. The player is Kal Solar, and work as a agent for the Interplanetary Federation, on a mission to Alpha II colony on the moon Xelos. Aliens are attacking the science facility on the moon, and your mission is to stop them. You have to pass outdoor sections there aliens will attack you, but in the rooms and corridors of the complex you will find compass, infra-red scanners, keys, extra oxygene, batteries etc. The goal for each level is to find the locations of all alien eggs marked on the map and destroy them. To finish the game you also have to blow the reactor with the alien mother, and then escape from the moon.