You can still use source ports, mods and. If you really want to play the game straight out of the box, the Doom 3: BFG Edition comes with a playable version of Doom 1, Doom 2, the Master Levels for Doom 2 and more. It should work out of the box, otherwise, I can go tell you “go find a PC from the 90s and you’ll be fine playing this.” Why should there be that extra step involved? When you buy a hot dog, does the vendor tell you go across the street to cook it? What’s odd is that Doom 2 works with its DOSBox, but the Master Levels and Final Doom crash on startup. Sure you can download a new version of DOSBox or even go find a great source port like GZDoom to run the game, but the fact is one of the two of them should come with this Steam version. That’s probably why this game is on sale so often for as cheap as it is. The problem with the Steam version is that it comes with an old version of DOSBox which crashes on startup. The Ultimate Doom takes the exceptional and timeless first person shooting classic Doom and adds a single new episode to the already three episode game.