Brain Test Level 187 Answer
Scrubbing at the number or flicking it off the screen, which does nothing at all. The level wears a maths costume and is really a word puzzle.
The puzzle
I hate math! Get rid of this number!
The answer
Drag the letter G in front of the word 'one'. The number one becomes 'gone', and so it goes.
What most people try first
Scrubbing at the number or flicking it off the screen, which does nothing at all.
Why that is the answer
The level wears a maths costume and is really a word puzzle. The number is spelled out as the word one rather than printed as a digit, which is the clue that letters matter here. Slide the loose letter G in front of it and the word reads gone, which is precisely what the instruction demanded. Nothing is calculated and nothing is deleted.
If your level 187 looks different
Unico Studio shuffles level numbers between game versions and platforms, so the puzzle on your screen may carry a different number from the one here. If the question above is not the one you are looking at, the full levels 151 to 200 walkthrough lists every puzzle in this stretch by its question, which is easier to match than a number.