Start of stage 4. First boss might be improvable. Verification : http://tasvideos.org/userfiles/info/40020121281751601
Why not do the NES version? You can watch the current publication of the NES version and append it at the start of the second loop.
Quoting PikachuManWhy not do the NES version? You can watch the current publication of the NES version and append it at the start of the second loop. There is a save function exclusive for GBA version that I abused to save a few frames.