Fragile Alliance is the game's online multiplayer mode, which consists of four maps: Hot Coffee, Late Night Opening, Withdrawal, and A Walk In The Park.

A free-to-download map pack released on PlayStation Network and Xbox Live provides four additional maps. The goal is to finish a several round match with the most money. Each round begins with all of the players as armed, balaclava-clad robbers, and players who have reached TrueSkill rank 50 and 30 will play as Kane and Lynch, respectively. Money can be used to buy better firearms and armor. Resistance is met in the form of armed AI controlled security guards and/or police officers. A player's money acts as a shield, but will quickly be dropped on the ground as the player is injured. To escape the level, a player must survive to meet a getaway car. All players who survive without turning on their allies will split stolen money evenly.

A player's appearance in the game is influenced by their TrueSkill rank on the Xbox 360. Unlike Kane and Lynch's campaign mode, players cannot sprint. If a player feels they have taken enough money to become a target for potential traitors, they can drop some of their money, becoming less of a scoring threat.


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