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.

That means there are 253 ways two genres can be chosen.

Missing (none found):
Brawler + Pinball
Card & Board Game + MOBA
Fighting + MOBA
Fighting + Pinball
MOBA + Music
MOBA + Pinball
MOBA + Platform
MOBA + Point-and-Click
MOBA + Puzzle
MOBA + Quiz/Trivia
MOBA + Racing
MOBA + Simulator
MOBA + Sport
MOBA + Tactical
MOBA + Turn Based Strategy
MOBA + Visual Novel
Music + Pinball
Pinball + Platform
Pinball + Point-and-Click
Pinball + Quiz/Trivia
Pinball + Racing
Pinball + Real Time Strategy
Pinball + Shooter
Pinball + Strategy
Pinball + Tactical
Pinball + Turn Based Strategy
Pinball + Visual Novel