Boss Door

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Boss Door
Horizontal and Vertical Boss Doors
Game information
Description: A door which creates more tension when approaching a boss arena. (

Usually leads to a boss arena. Locks when a midboss or boss is present. (1.5.0+)

Category: Boss
Added in version: 1.0.0
Series information
Game of origin: Mega Man
Programmer(s): WreckingPrograms

The Boss Door is a placeable Level Object in the boss item category. The door acts as a one-way gate, preventing the player from returning the way they came, as it only opens in one direction. Curiously, only the side of the Boss Door that the player cannot enter through is considered a solid object. Crossing one resets enemies and level objects to their original positions. The player can only pass through a Boss Door if there is enough space on the other side of the door to pass through.

Horizontal doors are entered by simply walking through them, while vertical doors are entered by falling/jumping through it, or climbing a ladder into it.

In versions prior to 1.5.0, the Boss Door could be crossed if there was a boss or a midboss. However, those versions were Unused Content for backwards compatibility, while prior versions block the access to the other side while there is at least one boss active or if there is a midboss enemy visible alongside the Boss Door. This was done to adapt the Boss Doors to the concept of multiple bosses introduced in that update. As of version 1.7.5, "midboss" enemies included are Hot Dog, Tama, Whopper, Squidon, and Lantern Fish. If one or more of these enemies are in a screen connected to one with a Boss Door but too distant to be in the same line of sight, the Boss Door can be used.


  • The Boss Door can easily be used to enter an unused space in a level. This can be done by simply placing the door next to (for vertical Boss Doors) or above/below (for horizontal Boss Doors) an unused space, causing the player to be transported through the door into the unused area.
    • In an unused area, the player can sometimes clip through vertical walls. If there are tiles at the top of the section under the unused section, the player will stand 3 tiles above the actual position of these tiles.
  • Boss Doors in versions prior to 1.5.0 can be crossed if there was a boss despite it betraying their purpose.


  • Boss Doors can come in many shape and sizes. As of 1.7.5, there are only classic white vertical and horizontal doors, 4 blocks height.