At the beginning of the game, you are given 10 random numbers, from 1 to 9. These numbers appear in the center in a random order, and you decide to add or subtract them. When all the numbers run out and there will be only zeros, and the amount will be in the range (for example, the amount is 7, and the range is 5-15), then you have won and move on to the next level. At level 2, the numbers will be increased by +10, from 1 to 20, and so on with each new level. And the range will decrease. If you lose or exit the game, the level will reset to 1. The level lasts 1 minute, after the time expires, the loss will be counted.
There is a saving of the results, where your maximum level and the time for which you reached it are stored.
All the collected fruits are saved, and for them you can buy an attempt to pass the level again, but for this an additional minute is recorded during the record.