by this i mean games like in unity or something that required decent PC's as i've just got a new one that can actually run stuff and wanted some reccomendation. i have no real limits on these kind of things so just send anything.
Honestly, some of the games are so badly unoptimized that they are "high-end"...
One kinda obvious recommendation would be fully modded skyrim/fallout 4. Possibilities are pretty big. Or look into wabbajack for ready-made modlist.