Jazz Jackrabbit 2 Plus (JJ2+) adds countless features and bug fixes to both Single Player and Multiplayer gameplay within JJ2, and is used almost universally by most serious players. It has much better network code than the original game, adding console commands to online games, fixing most major game-crashing errors and connection problems, allowing permitted clients to log in as "remote administrators" in someone else's server and control the gameplay, and adding several new multiplayer gamemodes. It additionally fixes or enhances many of the events in the game, and allows level designers far more power than in regular JJ2 through the addition of an easy-to-use scripting language. JJ2+ takes everything great about JJ2 and adds so much more on top of it; it is truly a must-download.
A lot of example levels for JJ2+, demonstrating how to use various new features. The suggested starting place is plusMenu.j2l, which serves as a hub for all the other example levels. This is strictly an optional download, but it's harder to get a sense of how awesome JJ2+ is without it, so click away! Tetris, illustrations of new online gamemodes, multiplayer levels, epic single player experiences, timers, and more await you.