I found it on my desk, and I know I’ve seen there before, but I can’t remember where it came from. I have a MoYu 4×4 and its tutorial, which includes the step ‘solve like a 3×3’ (sort of. Translated from whatever language by Google Lense and turned into normal English-Cubian by me). Maybe it included a separate 3×3 tutorial. That, or it came from an ancient non-cube MoYu bundle I got two years age – unlikely to get a 3×3 tutorial with a trash square-1, skewb, pyra or mega. Plus, I’m pretty sure I threw all those manuals away.
So I’m pretty sure it’s from the 4×4, but it’s still a very random thing to discover I’ve had all along, OK? Let me tell my story without bringing logic in please.
Anyone have any other ideas, or can prove my theory?