Hobbit Battle
From BelegarthWiki
In a Hobbit Battle, participants fight using only short swords and must have their elbows touching their sides at all times, as well as remaining on their knees.
The arm above the elbow is counted as the torso for hit purposes, and when struck in the leg, players must plant the knee and remain in place. They can still pivot to face opponents.
Other than that, any game can be played Hobbit style, though it tends to work best in a one on one form, as any kind of movement is difficult on the knees.