Coins are the main currency of the Mushroom Kingdom. They first appear in Mario Bros., where they move along the floor and are worth 800 points if Mario catches them. They later appear in Super Mario Bros., where they are demoted to ten points per coin. If Mario jumps up and hits a ? Block, Coins may pop out. When one hundred Coins are collected, the player is rewarded with an extra life. The count of coins then returns to zero, enabling the player to earn 100 coins again. In Mario Bros. and Super Mario Bros. 3, the actual symbol representing Coins is identical to that of the Canadian and American dollar ($). However, this was changed in the remakes.