Blue Coin
Blue Coins first appeared in Super Mario 64, and were worth five Gold Coins each. There are also Blue Coin Blocks; when Mario attempts to Ground Pound on them, the Blue Coins appear near to Mario as the time starts. They return in Super Mario 64 DS.
In Super Mario Sunshine, ten Blue Coins can be exchanged for one Shine Sprite. There were 240 Blue Coins in the game, so a total of 24 Shine Sprites could be exchanged for Blue Coins. They do not affect the number of Gold Coins that Mario has collected though. On a side note, the player receives the option to save his/her game for each Blue Coin he/she grabs.
In Mario Pinball Land, these coins can be obtained by making a combo without using the flipper. Mario can use them to play mini-games from Toad for Power Stars.
In New Super Mario Bros. Wii, Blue Coins appear only after a P-Switch has been pressed. They will add only one coin to the player's total coin count, similar to a regular coin. They will disappear after a set amount of time, like Red Coins, but unlike Red Coins, there are more of them and collecting them all will only gain the player a round of applause from an invisible audience, instead of a 1-Up Mushroom or power-up.
