Red Coin
Red Coins were first seen in Super Mario World 2: Yoshi's Island, in which they were hidden behind regular Gold Coins. The only way to tell which Gold Coins hid Red Coins was to grab them, or use a Magnifying lens. There were twenty coins in each level, and if you grabbed all of them, they counted as twenty points for your score at the end of the level.
They were later seen again in Super Mario 64 and Super Mario 64 DS, in which one was worth two Gold Coins. Collecting all eight in one course would make a Power Star appear over a Star Marker.
They made another appearance in Super Mario Sunshine. This time, collecting all eight in a level would make a Shine Sprite appear.
In New Super Mario Bros., there were Red-Coin Rings in most levels, and if you jumped through one, eight Red Coins would appear. If Mario or Luigi collected them all in the time limit, they were awarded with a power-up.
Red Coins are the most used secondary coins.
