This question and its replies on Game Pass hidden gems is a great reminder to me, that I should get to my Game Pass backlog already. Sheesh.
Forgotten City
Citizen Sleeper
Unsighted
Octopath Traveler
Hollow Knight <---- stuck on a boss
Subnautica <---- got lost, I should start over and use beacons this time
Prey
Psychonauts 2
Wasteland 3 <---- Need to return to that Reagan faction area
NORCO
Phoenix Point
Sniper Elite 4 and 5
State of Decay 2
Rage 2
Doom Eternal
Halo Infinite
Power Wash Simulator
Hades
Man Eater
New Super Lucky’s Tale
Yakuza: Like a Dragon
SpiritFarer
Tunic
Outriders
Dragons Quest XI <---- I was exploring using a ship
Gears Tactics
Ok, I’d better stop now.