Key Coin

Key Coins are a special type of coin that first appears in Super Mario 3D World and reappears 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 1,000 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.

Key Coins are present in the Super Nintendo World theme park areas, where they are simply known as keys. The keys are guarded by Bowser Jr.'s minions and attendees are required to collect three of them in the Power-Up Band Key Challenges in order to access Bowser Jr. Shadow Showdown.