Add Up!

An unusual Tetris clone with mathematical rules. Blocks with numbers fall from above, and their positions can be swapped. The player's task is to combine three numbers so that the sum of 15 points is obtained horizontally, vertically and diagonally. The numbers arranged in this way disappear, making room for new ones. Be careful not to let the sum of the three numbers reach 14. If this happens, they will be replaced with blocking crosses, which can be removed if numbers with a value of 16 are combined above them. The game ends when there is no more room for new blocks with numbers.