1) blue, 2) red, 3) blue, 4) yellow. It means you have to remember the old colour on the old level. I hope you remember !
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The impossible quiz question 56 YouTube
There seems to be a glitch where you would lose a life over time so be quick on this one.
Web that's why it says :
Just like with question 47, this one remains pretty much the same in the ios version of the impossible quiz, with the difference that since there is no cursor, the vanish liquid will.