Alliance of Valiant Arms (Korean: 아바) (abbreviated as A.V.A) is a free-to-play online first-person shooter video game, developed by Red Duck Inc. and is using the Unreal Engine 3.

In North America and Europe, the game service is provided by Aeria Games, in the People's Republic of China, Tencent Games runs the server, and in Taiwan, it is run by WarTown. In Japan the game is hosted on Gamechu.

On June 15, 2011, A.V.A became available for download throughSteam. However, it currently isn't available in some regions and some in-game items (particularly certain weapons) are only available to players in certain countries such as South Korea and Japan.

There are currently 10 game modes in the Aeria Games version of A.V.A:

• Annihilation - Players will be pit against each other in two teams that will attempt to reach a pre-set score, similarly to Team Deathmatch. Alternatively, the team with the highest score once the time runs out will win.

• Demolition - To complete the mission, the EU forces must plant the bomb at one of the two bomb points while the NRF forces are tasked with stopping them. The EU forces will win if the bomb is detonated while the NRF must disarm the bomb if it has been planted to win. Alternatively, one team will win if the opposing team is eliminated (if the bomb has notbeen set). If the bomb is set the NRF must either A) just defuse the bomb by defending their defuser or B) eliminate the EU Forces AND disable the bomb. In either case the bomb must be defused once it has been set.

• Escort - The EU forces must escort a tank past enemy lines and repair it if struck down, while the NRF forces will be tasked with preventing this, usually by constantly taking the tank down with RPG's.

• Convoy - The EU forces must transport a designated object to the target area to win. The NRF forces must prevent the EU forces from taking the object.

• Domination - Both teams compete for domination over a target. The team with higher domination gauge or the one in control of the target when both sides have the same gauge will win.

• Free For All - Players are pit against each other. The match ends when one player reaches the pre-set score or time runs out in which the player with the highest score wins.

• Cross Steal - Both teams are tasked with retrieving the enemy's launch key and returning it to their own base, while defending their own launch key.

• Infection - Each match will begin with a countdown. During the countdown, players must set up a defensive position or plan a strategy to combat against the zombies. When the countdown is up, one or more players (depending on the total number of players in the match) are transformed into zombies randomly. Human players must survive until the time is up, while the zombies must infect all human players.

• AI Mission - A group of 4 or 6 players are automatically assigned to the EU to survive and/or complete mission objectives while fighting against AI-Controlled NRF.

• Escape - EU troops try to escape to a waiting boat while NRF troops try to stop them. The round ends when the opposing team is wiped out, or when one soldier makes it to the boat.