Doom Classic for iPhone is out, and all the old cheats work.
I just downloaded it, so I don’t have much of a review, other than that initial impressions are fucking fantastic. You can access the cheat menu by putting four fingers on the screen and holding for a second, a keyboard pops up, and you can enter all the old classic Doom cheats. IDDQD for god mode, IDKFA for all weapons/ammo, etc.
