Within the files of Mixels Rush exists unused content that is normally inaccessible through normal gameplay. This article is intended to list all found instances of unused content.
Graphics and strings exist, hinting in the existence of an animation editor. The editor doesn't function and is turned on by default.
In the file with the Mixels graphics, there are some placeholder playable characters. These feature a slime, construction boxes and a plant.
Within the files exists unused storyboards.
All tribes had unused versions of their floors.