How to beat theself after taking the X Potion

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When I use the X Potion from any level, I get teleported to an area where I fight myself. But, I can't seem to win!

Whenever I try to heal, the other me heals as well, so I keep dying before I can kill myself! How can I win?

Best Answer

You can find the answer by reading the scrolling text in the background (use the time slowing ring if you find it hard to read). The answer:

Wear the crown you get from killing the Octopus King and just autoattack. You'll survive on 1HP.