You can even go to a level from that chapter, exit it before finishing it and the same thing will happen. It can also be done by going to the level editor and exiting it. For example, if you go to a different chapter, play a level and then exit it, the same thing happens. There are multiple instances where this can happen. the red cross disappears), but everything else stays the same.
An example of these kinds of levels is Business Guy: Level 12 and Irresponsible Dad: Level 15.
The first level in each chapter gives a tutorial on how to control the character of that chapter. These levels are (re)presented as small, transparent boxes, each of which is numbered from 1 to 15. Each chapter contains 15 levels, arranged in a 5x3 array (i.e.
The mobile app levels are also organized in chapters. Unlike its online counterpart, none of them were made by other users, and they can only be played on the app. These levels are organized by playable character and by difficulty. The Happy Wheels Mobile App has a selection of pre-made levels for people to play on their mobile device.