"a multiplayer party game developed and published by Ubisoft. It consists of two modes: an arena fighting mode, and a racing mode. It is a 1-4 player game, or you can play with 1 player vs. the computer. There are three levels of difficulty: Beginner, Pro, and an unlockable Master. There are also 4 cups to be won in both the Battle and Race modes."
"The game was originally intended to be entitled Rayman M in all countries. However, in some age rating systems, M is used to state that the game is for a mature gamer, causing the game name to be changed to Rayman Arena."
"Rayman Arena features 9 different playable characters for the Xbox and Nintendo GameCube, while Rayman M, features 8 playable characters with the PlayStation 2 and PC versions of Rayman Arena"
Source: Wikipedia, Rayman M , available under the CC-BY-SA License.