Jack Of Owls
Arcane
The recent Far Cry 6 doing stealth runs of major enemy installations on hardcore mode with all enemy UI options (silhouettes, hitpoint indicators, tagging, grenade indicators, etc) disabled can be balls hard if you want a real challenge. Maybe a mod or two that stops regenerating health and gives only 25% health replenishment with health packs. Otherwise if you play on default settings, a literal retard could breeze through the game. Also, no animal companion for added challange; however, it will be difficult to resist those cute critters like deadly iridescent chickens that you've leveled up to go into "roid rage" that peck enemies to death or ghostly jaguars that sneak up, pounce and kill.