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Level 6287 needs to be looked at. If you play the fish booster you end up with no way to release the two yellow keys at the bottom left of the screen. Now that boosters are timed and some "prizes" from events include automatic fishes there should never be a level where this will make passing it impossible.
Screenshot of starting board
Screenshot of what I was left with after fish was released
It appears that the chewing gum has to be popped from the bottom up in order to release the caged yellow key to then fall and hit into the two on the left. So if a fish is played it will pop the chewing gum at the middle or top hit and then the caged key is popped instead of dropping to hit the other two keys.