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The Skeleton Key appears three times as an item in the Mario Party series.

In Mario Party series

The Skeleton Key appears in both Mario Party 2 and Mario Party 3. The Skeleton Key in Mario Party 2 has a more feminine look while the Skeleton Key in Mario Party 3 appears more masculine. In Mario Party 2, the skeleton key can be bought for 20 coins or found in item mini-games. The Skeleton Key unlocks secret doors on board maps that lead to short-cuts and events. When a character approaches a door on a board map, they will have the option to open the door if they had a Skeleton key. In Mario Party 2, a character was not able to discard the Skeleton Key unless they use it on a door. However, in Mario Party 3, the character has the option to discard the key.

The Skeleton Key returns in Mario Party Superstars as an item, retaining its Mario Party 2 appearance. It can be used in the Space Land, Woody Woods and Horror Land boards.