Threes!

Threes! If you like mathematical puzzles, then this game is for you. On the Board there a couple of chips with numbers, summing them, and form one of the chips with the number equal to the sum of the previous two. In this field, the more chips that you should be a number, the sum of which is equal to the previous value, only then will you be able to combine them. With each stage the level of difficulty increases, and you need to stretch your gray matter in order to pass the game to the end.