Doom: Fall of Mars is a fan-made RPG set in the Doom universe. The game was announced on August 2, 2008 and its first alpha version was released on August 26, 2008.
This game, which is based on the original Diablo and has the affectionate nickname of "Doomablo", has you penetrating into the base of Phobos and has you fighting your way through 20 levels worth of monsters in order to reach the final level of Hell and the source of the demonic invasion.
Gameplay works for the most part much like Diablo -- killing monsters grants you experience points, which are used to level up. Strength, Dexterity, Vitality and Will are your main stats, and you gain points to distribute between these stats as you level up, and also gain points through various items you collect on your way. Also, much like Diablo, the monsters get tougher every time you go down a level of the dungeon. Unlike Diablo, however, you will be fighting pretty much all your opposition at range with weapons like pistols, shotguns, chainguns, plasma guns and even rocket launchers.