It is a direct, community-driven spiritual successor and patch for Project M 3.6.
To play (or its popular successor, Project+ ), you must have a specific version of the Super Smash Bros. Brawl (SSBB) ISO. The mod is specifically designed to work with the NTSC-U (North American) version of the game. ISO Requirements & Compatibility
Once you have obtained a Super Smash Bros. Brawl ISO file, you'll need to follow these steps to use it with Project M:
So, dig up that ISO, fire up Dolphin, and get ready to Wavedash. The stage is set, and the timer is ticking.
This is the most popular way to play "Netplay" online with others.