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9x9! It's kinda fun in that it takes me a while to solve (~20 minutes) and it doesn't require much thought, so I can have something to do with my hands/eyes as I listen to an audiobook.
Favorite cubing YouTube channel with <10,000 subscribers (not including yourself if you have one )?
If you mean OS as in opperating system, then MacOS. If you mean Original Story, then Harry Potter. If you mean Official Soundtrack (as in from a video game), then the soundtrack from Pokemon Mystery Dungeon Explorers of Sky.