This is not based on my opinions! If you think any of these classifications are incorrect, you can change it yourself on IGDB!

Companion lists in this folder: https://www.backloggd.com/u/tendog/lists/folder/genres/

As of May 7, 2024, there are 23 Genres on IGDB:
Adventure, Arcade, Brawler (aka Hack and slash/Beat 'em up on IGDB), Card & Board Game, Fighting, Indie, MOBA, Music, Pinball, Platform, Point-and-Click, Puzzle, Quiz/Trivia, Racing, Real Time Strategy, RPG, Shooter, Simulator, Sport, Strategy, Tactical, Turn Based Strategy, and Visual Novel.