The Impossible Letter presents a delightful yet highly challenging find the difference experience. In this game, you are tasked with carefully examining a group of characters and determining the one that doesn't fit in. For example, when presented with 4 letters arranged in a 2 by 2 grid and one letter appears distinct from the others, your objective is to touch that specific letter in order to progress to the next level. At first glance, it may seem relatively straightforward, but wait until you reach level 50 of this free online game.