Each person throws four dice, adds, subtracts, multiplies and divides to get a 2-digit number, and then draws out the corresponding one of the building blocks and puts it on it, or puts it aside. If the building block falls down, whoever pulls it out will lose.

There is also a way to play: each person rolls two dice and combines them into two digits at will, and then draws out the corresponding one of the building blocks and puts it on it, or puts it aside. If the building block falls down, whoever pulls it out will lose.