I've been playing tons of Civ 6 on it and its been great.
Tekken 7, Warframe, WoW 3.3.5a(warmane)
All of them run flawlessly
Added through Heroic Launcher, Magic The Gathering: Arena
Final Fantasy XIV with ACT, mods with "ffmt" tools, perfectly synergized between them, thanks also to Lutris and GE Proton runner. And quite all of my games from Steam and Ubisoft games (also installed thanks to Lutris) ect..ect...
I'm also believing that (probably you'll say to me otherwise. that day when Valve officially revealed to the world about SteamDeck, that it would run on Linux and so on, gaming, finally on this OS.... finally has received it's huge boost. And I must confess, in that precisely moment, all my doubts and fears about whether or not to switch from Windows to Linux have literally evaporated forever.
Minecraft (thru PolyMC)
Classic Doom (thru GZDoom)
Roblox (thru grapejuice)
If my prefered quake source ports are compiled ill download them too and play
I enjoy racing games
fallout new vegas
ace combat 7
skyrim special edition
euro truck simulator 2