through the Elecbyte website. Although this build had various visual glitches and required a fair amount of adjustments to the previously made content in order to be fully compatible with the new engine, Elecbyte has stated that it is their goal to have the new Mugen fully compatible with previously designed content. On January 18, 2011, Elecbyte released a 1.0 version only for Windows, ironing out most bugs that were featured in the release candidates. It was compatible with almost all, if not all, of the previously made content. After the 1.0 release, Elecbyte again ceased public activity for an extended time. In late April/early May 2013, a leaked copy of Mugen 1.1 alpha 4 hit the Internet. This version added stage-zooming capabilities and some other features, although as expected with an alpha, it had numerous bugs. A post was made on the website on May 11, 2013 regarding the forums having problems. However, as of May 28, 2013, the forums are back online. In August 2013, Mugen 1.1 beta 1 was released to the public, which fixes many of the bugs from the 1.1 alpha versions. Additional releases for 1.1 were planned and being worked on. These releases were planned to include significant engine changes that would remove certain character development constraints that existed due to limitations of the old code. On July 8, 2014, a fan-made port of Mugen 1.0 for Mac OS X was released by Mugenformac, built using the "Wineskin Winery" wrapper. It ran with few to no port-related issues. Version 1.1 beta 1 of the Mac port was then released on January 3, 2015. Since 2015, Elecbyte's site went offline for unknown reasons, displaying a 403 message, except for pages pertaining to official documentation; Elecbyte's last activity was in 2016, promoting a crowdfunding for Rotten Core, a commercial fighting game that was approved to use the engine (the engine's license typically prohibited commercial usage). An open-source reimplementation project called I.K.E.M.E.N began development in 2010, adding additional features such as online play. Customization Users who develop content for the game engine are commonly referred to as authors. These authors create customized content such as characters, stages and screen packs/skins. Often authors will port popular characters from 2D fighting engines such as the Street Fighter series, or from TV, book, and game series such as Teenage Mutant Ninja Turtles, The Simpsons, Pingu, Super Mario, Sonic The Hedgehog,