Doom II online DOS game is a first-person all shooter arcade game, that can be played single-player and multiplayer and its part of the homonymous franchise. The player assume the role of the main character, a space marine known as ‘the Doomguy’, who finds himself in marine military bases on the moons of Mars and Hell and, through all the levels of the game, has to defeat its enemies, in order to escape away. All the levels are united together into named episodes and at the end of each of them, there are some final bosses to fight. The levels are often drawn in a maze or labyrinthic shape, that the player can see on the screen an automap to orientate himself. On the screen, he can also see many different bars, based on health level or number of ammunitions.