Number balls

Game «Number balls» will allow you to develop your memory and your reaction.
The game is simple - on the screen of your devices balls, with numbers painted on them, appear in random order.
You need to click on balls in arithmetical order. In that case, they will disappear.
For example, if you see balls with numbers 45, 78, -10, -5, 15, you need to click on the balls as follows: -10, -5, 15, 45, and 78.
For a quick tap on the right balls you will be awarded with extra points.
The amount of balls and the difficulty of the game increase with each level.
You have to remove all the balls in 15 seconds.