The $7 game, designed by John Carmack, features customizable control schemes, 36 levels spread across four episodes, a bounty of weapons and multiplayer support.
Here's the full break-down of game features:
Play the legendary first person shooter, DOOM, with an iPhone or iPod Touch
Fight through 36 missions in four action-packed episodes: Knee-Deep in the Dead, Shores of Hell, Inferno and Thy Flesh Consumed
Experience DOOM multiplayer on your mobile device, including Deathmatch and Cooperative play for up to four players via wireless internet
Choose from three different control types and customize the interface to suit your style
Explore the depths of Mars while utilizing the top down map to help your journey and save your game on the fly
Listen to the original soundtrack or disable it and use your own iPod music