The best alternatives to Tileshade are Color Match, The Colour Game, and Match!. If these 3 options don't work for you, we've listed a few more alternatives below.
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How good is your color perception? How good is your memory? The simple 10-round Color Match game presents you with a randomly selected color for three seconds, and then asks you to match that color as closely as possible. It's harder than you think hawk-eye!
Match! is a game about shapes and colors. It also challenges your reflexes while being under pressure. The game is lightweight and requires no Internet connection.