Level 4 always, imagine Magician Lord on level 8 would be absolute hell.
Either the 2nd to last or last level cannot be completed on Level 8. There was some glitch where you can't jump past something. This was a long time ago, so I can't be specific. It was beatable on level 7 IIRC.
I know there's multiple revisions of the game, at least on AES, so it's quite possible that there's a revision that works.
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