How to get to the secret level in Medival Kin(-)(-)(-)(-)(-)(-)
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1. Go to position 186.40 (press F9 twice to show the position you are currently on).
2. Use the red spring to get up to the platform, where there are two gold coins with some trigger blocks around.
3. From there, jump far to the right. You'll land in a little room and get warped into the secret level.

Beware though, because it's bugged like I said.