i've tried looking for the secret boss but i can't find it? what round is it on

i am stuck trying to do these acheivments can anyone point me in the right direction i know its something to do with the round 20 boss but dont know what to do? also i have no lead on doot.

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Used a biscuit tree and it made a biscuit with a sprite that cant be found, can no longer open inventory or crashes. Anyone else with this issue?

Get past 10 or more rounds in the color sequence minigame... how do I do it?