That's a lot of thinking to do, but let's see..

  • Platformer - Celeste
  • Puzzle - Tetris, nothing against other puzzle games as there are some amazing ones, but there's no beating this classic
  • RPG - Trails of Cold Steel 4
  • Action - A rather broad genre, this I'd say Metroid Prime (which i consider an action-adventure game, rather than FPS)
  • Fighting - Blazblue (More specifically, probably Chrono Phantasma Extend)
  • MMO - Final Fantasy XIV
  • FPS - Unreal Tournament (1999)
  • Rhythm - Elite Beat Agents
  • Adventure - As with action, very broad. For the sake of making things simple for myself, I'm going to just interpret this one as point & click adventure and say Grim Fandango (which ironically is not point and click but whatever, just roll with it )
  • Racing - Gran Turismo 3
  • Sports - Considering I haven't played sports games in ages..I'll say WWE Smackdown for PS2, can't remember which Smackdown game though.
  • Mobile - Genshin Impact
  • Survival Horror - Resident Evil 2 Remake
  • 4X - Civilization V, but really only by technicality because it's the only 4X game I've played.
  • Tactical/Strategy - Utawarerumono (either Mask of Deception or Mask of Truth)
  • Sandbox - Terraria probably? Only other real contender would be Minecraft, but I'd say I probably enjoyed Terraria more.
  • Visual Novel - Ever17: The Out of Infinity
  • Stealth - Deus Ex