Every four seconds colorful number will plus 1-10. Red Square=1,Green Square=2,Blue Square=3,Aqua Square=4, Tap them to make them plus equal to the plus part. When right number will plus 1-10,when not then this round is over. Number's color will change every second. When aqua left 4 seconds,3 when blue,2 when green,1 when red. If still confused you can press the T to watch tutorial. Thanks for you support and wish you have a good time.