Blue Coin

Blue Coins first appeared in Super Mario 64, and were worth five Gold Coins each.

In Super Mario Sunshine, 10 Blue Coins can be exchanged for one Shine Sprite. There were 240 Blue Coins in the game, meaning one could exchange them for 24 Shine Sprites.

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.

The Blue Coins found in Super Mario Land 3: Wario Land (called 100 Gold Coins) are a special kind of coin Wario can collect that awards him 100 Gold Coins.