Master of the Elements

Master of the Elements is an online game hosted by Nicktoons.com, in which Aang needs to master the elements to help him in his quest while fighting off dangerous Fire Nation troops and other enemies, while learning all four elements.

Description
Taken directly from the game:

''The young Aang has finally awoken from his long and frozen slumber. He learns that the world is in desperate need of the Avatar...Fire Lord Ozai and the Fire Nation have declared war against the other Nations.''

''Traveling through the Four Nations, he must become a master of the elements; Air, water, earth, and fire. Aang must now begin his quest to fulfill his destiny and become the Avatar.''

The balance of the world depends on his final victory.

Controls
Use the left and right arrow keys to move and the up arrow key to jump. Hit the up arrow key twice to double jump. Hit the down arrow key to block and hit the "Z" key to attack.

Trivia

 * Master of the Elements has a near 90% positive ranking on nicktoons.com.