The hack once crashed on zsnes after beating castle 2. i'm sure that won't happen that often, but just in case i whould recommend using save states on the overworld if you play on zsnes. i think it should be fine on accurate emulators, not exactly sure tho. tested castle 2 on zmz and it worked fine, that's all i can tell. however, if you see the game crashing on another level than castle 2, please tell me! i don't know how to fix the problem yet, if anyone knows how, i will update the hack with a fixed version!