This is a payment skill special training game that masters the “single and optimal payment method” according to the situation when paying small change.

Best suited for:
●Those who want to train their brains by paying with small change
● Elementary school students who want to improve their arithmetic skills
●People who have trouble with their coin purses

We are thoroughly committed to an algorithm that always evaluates the optimal payment method with the highest number of payments and the lowest change.

It is a game that continues to pursue practical optimal solutions.

You can always review your payment history and review your payment method.
In addition to your payment performance, we also recommend the best payment methods.
You can learn the best payment method by comparing the payment results.