Agreed it's doable BUT ONLY if you visit the secret room for invincibility which I always felt was 'cheating' and takes all the skill (and fun) away, because you go there fairly early then zip through all the later bits untouched...
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Mission 9 is all about speedrunning, it's hard enough even with infinite energy. Just try to do it that way, it's still hard, but it's a different type of gameplay. It's not about fighting, it's about avoiding fights and knowing fast routes. But I can build a special version for you with 999 seconds if you like :)