Doom II: Hell on Earth is the sequel to the original Doom. While the game is a sequel, it does add to many new ideas to a formula that is regarded as a classic first-person experience. Instead, the game polishes over some the best elements of the original. The game plays, looks, and feels the same with the addition of new weapons and a more Hellish level design. While it is just a continuation, it is a great addition to the classic franchise.