“Rainbow tube:color sorting” is a color sorting game in which the player must correctly sort colored liquids into glass tubes, making sure that the colors do not repeat across all the tubes. As the level of the game increases, the difficulty also increases and players may need to use critical thinking skills to win the game. Players move the liquid from the top to another tube by clicking on the tube, but only when the top of both tubes is the same color. If the player encounters difficulties, props can be used to help them solve the problem.