Conversion

Conversion was a Portal 2 modification in development by Team Conversion. The game was a Portal 2 prequel and was going to feature a new non-linear storyline showing how Aperture Science turned into what we see in Portal 2. The mod was going to feature 6 chapters and would introduce new testing elements. Conversion was canceled in 2015 for unknown reasons.

Synopsis
In this mod, the player was to play as CJ. The most important difference from Portal 2 was the non-linear plot, and meeting new characters, such as August, the Administration Core, and Ben, the Security Core. Characters such as Wheatley and GLaDOS were also to return. The test chambers also introduced new testing elements.

Testing elements

 * High Energy Pellet
 * Pneumatic Diversity Vent
 * Reflection Gel
 * Heavy Duty Thermal Reflection Panel
 * High Energy Ring
 * Heavy Duty Super-Colliding Super Button Reverse Gravity Field (HDSCSBRGF)
 * High Energy Thermal Discouragement Beam Battery

Development
The mod was announced sometime in 2014. It was to have a length of 7-8 chapters, incorporating content and ideas from a canceled Portal 2 mod called Afterward, with a demo release March 28, 2014. It had a Steam storepage that could, by time of cancellation, account for "50,000" Steam users adding the mod to their Wishlists. The mod was canceled sometime in 2017, with another mod titled "prePostscript", being created by the leader of the the Conversion mod team in July of 2017. It had the same premise as Conversion but was going to be significantly shorter (reduced down to 3-4 chapters). prePostscript is reported to have been released on December 1, 2018; there is no download available for this title, however.