Doom I & II

Screenshots:

Background:
Doom:

Doom is still considered to be one of the founding fathers of the FPS genre, as it has been the basis of so many games since. You are a marine stuck on a moon base with an entire horde of demons and undead marines from Hell. Armed only with a pistol, your mission is simple and clear: Get bigger and better weapons to blast your way through a multitude of rigorous levels.

Doom II:

The sequel to the groundbreaking FPS Doom, you return to Earth having finally escaped the moon base, but the Demons you had fought back up on the Moon have beaten you back to Earth and have overrun towns and cities. It's once again up to you to show these alien scum that while there's still life in you, they haven't won yet!

Features:
Doom II:

# 30 new levels plus 2 secret hidden levels
# Old enemies return as well as new enemies including the deadly Arch Vile who is able to revive dead enemies
# A new weapon - the Super Shotgun
# More items to help you on your mission such as Megaspheres that grant you full health and armour