Blue Coin

From the Super Mario Wiki

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.

The blue Coins found in Wario Land 2 (called 100 Gold Coins) are a special kind of coin Wario can collect that awards him 100 Gold Coins.

Super Mario 64 / Super Mario 64 DS
Protagonists	Bob-omb Buddy • Mario • Luigi • Wario • Yoshi • Dorrie • Headless Snowman • Hoot the Owl • Klepto • Koopa the Quick • MIPS • Penguin • Princess Peach • Toad • Tuxie
Bosses	Big Bob-omb • Big Bully • Big Mr. I • Bowser • Chief Chilly* • Chill Bully • Eyerok • Goomboss* • King Boo* • Whomp King
Items	Power Star • Yellow Coin • Blue Coin • Red Coin • Silver Star* • 1-Up Mushroom • Mushroom • Power Flower* • Wing Cap • Vanish Cap • Metal Cap
Objects & Obstacles	Bill Blaster • ! Block • ! Switch • ? Block • ? Switch • Blue Coin Block • Crystal Tap • Fire Shooter • Green Shell • Cannon • Star Marker • Crazed Crate • Donut Lift • Lava • Pushy Wall • Pyro Box • Spinning Heart • Star Door • Treasure Chest
Locations	Battle Fort* • Big Boo Battle* • Big Boo's Haunt • Bob-omb Battlefield • Bowser in the Dark World • Bowser in the Fire Sea • Bowser in the Sky • Cavern of the Metal Cap • Chief Chilly Challenge* • Cool, Cool Mountain • Dire, Dire Docks • Goomboss Battle* • Hazy Maze Cave • Jolly Roger Bay • Lethal Lava Land • Rainbow Ride • Rec Room* • Roof • Shifting Sand Land • Snowman's Land • Sunshine Isles* • Tall, Tall Mountain • The Princess's Secret Slide • The Secret Aquarium • Tick Tock Clock • Tiny-Huge Island • Tower of the Wing Cap • Vanish Cap Under the Moat • Wet-Dry World • Whomp's Fortress • Wing Mario Over the Rainbow
Enemies	Amp • Bob-omb • Big Boo • Bully • Boo • Bookend • Bub • Bubba • Bullet Bill • Chain Chomp • Cheep-Cheep • Chuckya • Fly Guy • Fwoosh • Goomba • Grand Goomba • Grindel • Heave Ho • Koopa Troopa • Lakitu • Mad Piano • Manta • Micro-Goomba • Moneybag • Monty Mole • Mr. Blizzard • Mr. I • Piranha Plant • Pokey • Scuttle Bug • Skeeter • Snufit • Spindel • Spindrift • Spiny • Sushi • Swooper • Thwomp • Tox Box • Tweester • Ukiki • Unagi • Unagi the Eel • Whomp • Wiggler
* Exclusive to the DS version.

Wario Land: Super Mario Land 3
Bosses	Spike Bro. • Biifun • Hinyari • Funfun • Bobo • Zenisukii • Captain Syrup&Denpuu
Worlds	Rice Beach • Mt. Teapot • Sherbet Land • Stove Canyon • SS Tea Cup • Parsley Woods • Syrup Castle
Power-Ups	Bull Pot • Dragon Pot • Garlic Pot • Jet Pot • Starman
Collectibles	100 Gold Coin • 10 Gold Coin • 3-Up Heart • Coin • Heart • Key • Treasure
Enemies	Bee • Bird (Wario Land) • Boulder • Bucket Head • Chicken Bakku • Dangerous Duck • Demon Bat • Dropper • Fireballs • Floater • Flying Bomb • Gator • Ghost Goom • Helmut • Hermit Crab • Mole • Muncher • Pelican • Pinwheel • Piranha Plant • Pirate Goom • Porcupine Fish • Rat • Thundercloud • Walrus • Wanderin' Goom • Webber • White Puff