Hammerfight is a 2D physics based action game set in a medieval steampunk universe. The player is a member of a tribe called the Gaiars, a strong race who have battled with large bugs to survive. When the player's tribe is destroyed, he is taken prisoner and turned into a slave. As the player is discovered to be the last living human Gaiar, he is forced to battle in the arena. In battle, a man recognizes the player as the son of a friend, and together they plot the downfall of the Emperor who ordered the destruction of the Gaiars.