Click on the buttons with numbers that, when added together, give a sum equal to the number indicated in the line, which looks like this: 33 = a + b.

For example, if the line looks like this: 10 = a + b, and the buttons have numbers 2, 7, 11, 15, 8, 4, 14, 9 and 20, then you should click on buttons 2 and 8, since 2 + 8 = 10.

Initially, the range of numbers on the buttons is from 1 to 20. Using the right slider, you can raise the upper limit of the range to 99. Using the left slider, you can lower the lower limit of the range to -99. This will significantly complicate the game.

If you click on the smiley at the top of the screen, you will need to look for not two, but three numbers that, when added together, give the desired sum.

For example, if the line looks like this: 21 = a + b + c, and the buttons have numbers 2, 7, 11, 15, 8, 4, 14, 9 and 20, then you should press the buttons 2, 11 and 8, since 2 + 11 + 8 = 21.

This game mode is very difficult, especially if you have expanded the range of numbers up and down.

Each button with a number can be pressed only once, after which it becomes inactive and turns gray. To cancel the selected number, press the button with this number one more time.