Key Coin

Key Coins are a special type of coin that first appear in Super Mario 3D World and reappear in Super Mario 3D World + Bowser's Fury in Sunshine Seaside. Five Key Coins have to be collected to turn a specific Warp Box (With Key) into a regular Warp Box, similar to how Mario has to collect five Star Chips in the Super Mario Galaxy games to make Launch Stars appear. A counter on top of the screen shows how many Key Coins have been collected and how many are left. Collecting a Key Coin gives the player 1000 points.

Key Coins are found again in the Wii U version of Captain Toad: Treasure Tracker, where they are once again found in Clear Pipe Cruise.

In Super Mario Maker 2, Pink Coins take the form of pink-colored Key Coins in the Super Mario 3D World style. Additionally, Keys themselves resemble the one depicted on the sides of a Key Coin while in this style.