Algodoo

Marble calculator capable of adding,substracting and multiplying.
To perform addition/substraction, put choosen amout of balls in + or - port. Both registers can perform these operations.
To multiply A*B, add A into right register, then put B into left register in * port.

Press 1 and then 2 to perform example 4*3 operation. Result should be 1100 (12). Binary numbers need to be read from down to up.