Although Avatar: The Game is named after the movie, the story itself doesn't follow the plot of the film. Instead, the player takes on the role of Lance Corporal Ryder, a signal-specialist who is sent to the distant moon Pandora. Ryder isn't just any other soldier; they are one of the selected group of people taking part in the Avatar-program. Avatars are a hybrid of Na'vi DNA and human DNA created to better interact with the inhabitants of the planet: the Na'vi, tribe-like and technology-wise not very advanced people who are one with nature. Although the Na'vi are friendly at first, soon the humans want more than just diplomatic relations; they want to relocate the Na'vi to be able to strip the planet of its natural resources. A war breaks out, and it's up to the player which side will win.
Early in the game, the player must decide whether to help the Na'vi unlock the power of the Well of Souls or stay with the humans. Depending on their choice, the gameplay changes significantly: * As a human, the player can enter buildings, drive vehicles like buggies and helicopters, use full-body armor, and several different kinds of firearms including shotguns and flamethrowers. Pandora itself is against them, meaning both plants and animals will attack but grant experience points. As a human, the player can build pods that replenish ammo and health at specific locations. * The Na'vi are more than two meters high and cannot enter buildings or use human vehicles. However, Pandora herself is friendly, so plants and animals won't attack; this allows the player to ride strange horses or fly around on huge dinosaur-like creatures. While the player themselves can use a machine gun, normally the Na'vi rely on bows and arrows as well as strange swords and staves. If the player manages to pull off a five-hit-combo, a special attack becomes available. Na'vi harvest plants to get arrows and cell samples.
Both characters are controlled in a standard 3rd-person-shooter-fashion and have to collect DNA/cell samples. Once enough have been collected, the player gains the ability to get right back into the fight after their hit-points reach zero. Only if not enough samples have been collected will the player re-spawn at the nearest outpost. Both parties earn experience points for completing quests and killing enemies. Once enough points have been collected, the character levels up and gets access to new weapons and spells, allowing them to make themselves invisible, for example. Pandora is divided into several sectors, each featuring several challenges like lifting 100% of the fog of war or collecting a certain amount of cell samples. Fulfilling these objectives grants additional experience points. To further help the player in their quest, a world-domination-mini-game is available at each transporter. This mini-game is turn-based and has the player starting out with only one sector and the goal of conquering all the other. Doing so will grant their character additional experience points, increase their weapons strength, and such. Money for building bases and ordering troops on the other hand is earned by playing through the normal campaign. To conquer enemy sectors, three types of units are available that can only be built at a base. Combat is a simple numbers game and plays out automatically. To defend conquered sectors, a defense building for each type of unit can be built.
The game offers five team-based multiplayer-modes: King of the Hill, Capture the Flag, Team Deathmatch, Capture and Hold (capture control points to make the enemy team lose victory points), and Final Fight where the RDA has to protect three missiles in their base while the Na'vi have to destroy them.
Avatar: The Game was released on Xbox 360 in 2009 .