You can read the general documentation for more information. One way to think of JJ2+ is as a series of tools built into various parts of the game to give you and other users more ways of creating new Jazzy experiences for yourselves. JJ2+ is a massive mod of Epic Games' 1998 masterpiece Jazz Jackrabbit 2 (JJ2), adding countless features and bug fixes to both Single Player and Multiplayer gameplay.
JJ2+ Documentation Installing JJ2+ with GOG.com
