Abuse is a high-quality shooting game totally free! It's more or less like Doom, except that Abuse happens in 3rd person.
The goal of the game is the following: you are the only person on the planet who is immune to an alien gene that contaminated Terra, your mission is to fight the aliens. The idea is to play like any other shooting game, and you will be killing everything that passes by in front of you. Weapons and accessories will be waiting for you not to play the game.