Discreet gray tiles will help develop your powers of observation in FindTheDifferent. The task is to find a drawing that is different from the rest. The game has three modes: normal, where you move through levels with a gradual increase in difficulty under a time limit. Fast mode - time is very limited. Hard mode - a large number of small tiles, among which only one is different in FindTheDifferent. Choose the mode that suits you and go through it. You will soon notice an improvement in your concentration.
