This is a prototype image of my idea for money counting. The design is supposed to represent a cash register where a player manages their money. In this design I didn't really show what values the user enters and what values are calculated automatically but I figure those can be customized based on difficulty level. The user would definitely enter the amounts of each coins but the amount of math they are required to perform can vary. The right side of the cash register is set up like a typical addition problem so it will hopefully be a familiar format. As always, your feedback is welcome!