Hell on Earth is a game that follows up a similar gameplay to the one featured in Doom, where you had to battle monsters in different rooms in order to progress to the next stage. This time you will have to battle aliens and you will have to work your way until you get to the boss.
The thre dimensional graphics are not something that is too unique but they look good enough and the gameplay is also simple yet intriguing enough to make you play more. The game will be hard at some points because the monsters have special powers, though.