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Thanks and I'll post this clarification in the yoyo forums so you don't have to! Just to make sure I've understood you, you are using a different sprite for the collision mask (the green square). But is it still true that the instance calling tile_meeting_precise also needs its collision mask type set to precise per frame (as place_meeting says it does)? Otherwise it won't work, right?

I think I get it now but honestly it's pretty crucial to the setup that we understand that any moving objects calling this function are likely to need a separate sprite for their collision mask and both the calling instance and the checker object need to have precise per frame turned on (not just the checker object). Maybe that was obvious to you but not to me because I've never had to do that before; rectangular collision masks always worked fine for me so I just haven't had to do something else. There might be quite a few others that get equally confused when they get everything set up, but haven't picked a different sprite for the collision mask, and find that their character sprite's head is triggering collisions; or, because they didn't turn on precise per frame in their character object, bounding boxes end getting used instead of precise checking. I don't know if you can edit the yoyoblog post to clarify that now but it might help others avoid some headaches. Awesome job though! I really like how this method combines the best of different approaches!