Microsoft is confident that all consumers hwo pick up a copy of GTA IV on Xbox 360 will play the game via Xbox Live.
The console's online service allows up to 16 players to participate in 15 different online game types, ranging from co-operative play to cops-and-robbers team matches to free-for-alls.
Aaron Greenberg, the director of product management for Xbox 360 and Xbox Live in the US told Reuters:
"The multiplayer in this game is so well implemented that I can't imagine anyone owning a copy without trying to play it on Xbox Live.
"GTA is unique because it appeals to such a large audience. It will likely be the best-selling game launched all year and we expect it will drive a lot of new members to Xbox Live."
Greenberg added that he wouldn't be surprised” to see the game become the most popular title on Live.