How-To Instructions: Though being primitive Accumulate is a very addictive game. In order to play, you are just to move your cursor (it’ll look like a blue square) around the screen with the help of your touchscreen or the computer mouse. Try to set a new record getting scores by catching the green balls. If you catch a green ball, two more appear. A yellow ball caught can mean the change either of the figures’ size or speed. If you get a red ball, you lose.