Check this relaxing exercise for your brain – sorting the balls of different colors into the tubes! Make sure to place the same balls in a particular tubes and don’t mix them up. The idea is to sort the balls correctly and make those of one color stay in one tube. Let the red balls join the red balls, while the blues ones should appear in the other tube! Tap the tube when you want to place the ball inside and then move the another when this reservoir is filled. Place the balls on the top of the previous ones and do so until the tube is filled entirely.