The Rottenverse is a series of stories written by NSGM throughout August 2016. The Rottenverse details the life of Robbie Rotten, the Rottenverse is a multiverse that consists of four different canon parrallel rottenverses, all home to a respective Robbie Rotten of that rottenverse.
The Rottenverse timeline goes as below
The Rottenfellas universe
The Rotten Brothers universe
This universe, while very similar to the Lazy Town universe, follows not just Robbie but his special brother Rodni Rotten, who attempts to fit in with the other residents of Lazy Town.
The Lazy Note universe
This universe is in fact the same universe where the Scary Godmother charatcers reside, begining with Lazy Note , where Robbie obtains a book that makes people lazy by writing their name in it, it is then concluded in Dues Ex: Rotten Revolution where Robbie becomes "Composite-Rotten" by fusing with Elder Toguro.
The Lazy Town universe
This Universe is where the True Robbie resides and where the Lazy Town television series takes place, however in Steel Ball Rotten, using Rotten Deeds Done Rotten Cheap, he gathers other Robbies from the other existing universes to combat Sportacus.