Extremely what doesn't belong is a what doesn't belong map with a twist: each room has two parts, one upstairs and one downstairs.
Both feature a what doesn't belong. Downstairs, this what doesn't belong has two solutions, the one upstairs has one.
You can't input the answer upstairs though, instead this answer points you to the block you need to select to progress.
Selecting a wrong answer kills you, selecting all "fake" odd one outs grants you a secret.