DooM II: Hell on Earth (1994 Id Software) Ahh, Doom, Doom... the game the single handedly invented the First Person Shooter genre. No, it wasn't the first, nor was it the second, but it was definitely the best at the time. It's sequel, Hell on Earth, gives us - aside from 30 new levels, monsters and an improved engine - even better gameplay than the original. This is truly a classic, and one that can't be missed.