This is likely one for people who just happen to have it in their steam library from years ago, rather than hunting down a key and buying it. However, Poker Night 2's an interesting and bespoke game.
Obviously, you play Texas Hold'em or Omaha, but that's not the real reason to play. Instead, you're playing this game to be immersed. Yeah, it's weird. Normally, immersion comes from haunted hallways, vast battlefields, or open-worlds, not listening to people banter during a poker game, but it's surprising compelling and charming, with enough dialogue that there's still plenty of new things to hear even after hours of play.