This is inspired by this here thread and the sonic steam deck guide. My findings of how to play any source port on the go with Valve's Steam Deck. Because why not play Doom on the go? I will be updating this post as (or if) I test more and more ports. These are all tested with a 512GB Standard Steam Deck.

All of these (obviously) require you to go to Desktop Mode. You can access it by pressing the steam button, going to "power", then selecting "switch to desktop".

Classic Doom
Console Doom
Misc. Doom
Other Id Titles