Try to destroy the enemy fortress before it destroys yours! Watch “Avatar:The Last Airbender” Online Avatar Fortress Fight 2 by Nickelodeon Instructions How To Play: Please consult the online instructions from the game menu The second part of the great catapult battle game Fortress Fight! How to play: Use Mouse to interact. Fortress Fight 2Play Avatar Fortress Fight 2 a fun free online flash game for girls. Destroy your opponents' fortress before they destroy yours!