You may already know that im working on UndertaleSB and Raindrop Vally and both games require BGcollisons but I use bgofs to move. The traditional meathod isn't working. If you want to see my code see my Raindrop Vally post

Could you download C3A3Q4Z6 and refer to main program, especially line 149-167? Please download it asap because I'll keep it on the cloud server temporarily.

Is the head partially passing through the block?