Portal 2 challenges players to navigate through physics based puzzles while they are being studied by an entity called GLaDOS. She is the antagonist, but also seems distant and uncaring. This is already a humorous concept, but her sarcasm and mocking tone really help establish her presence, even if most of your interactions are over a PA system.
The humor is welcome because the puzzles can be stressful and a gauntlet of them risks being potentially frustrating. Stephen Merchant’s performance as Wheatley and the pleasant ending credits also produce a fair amount of laughs. The game isn’t afraid to blend wry humor with silliness, and I appreciate that.