Red Coins are coins that appear in various Mario games. They give you a prize for collecting all of them. Their last appearance was in New Super Mario Bros. Wii. Red Coins only appear if the player goes through a Red Ring. Once he does, 10 Red Coins appear. If Small Mario collects all 10, he is given a Mushroom. If Super Mario collects all 10, he is given a Fire Flower. If Mario with any Power-Up (excluding the Mini Mushroom) collects all 10, he is given a 1up Mushroom. By touching the 1up Mushroom gives Mario a 1up. Red Coins are quite common coins, probably 3rd in line of the most common (after Coin and Star Coin) in New Super Mario Bros. Wii. Red Coins have different looks. The picture here shows a Red Coin in Super Mario Sunshine.