Nidhogg

"Nidhogg is the award-winning fencing tug-of-war, full of graceful acrobatics and clumsy stabs. This is the ultimate two-player showdown of fast-paced fencing and melee attacks. Beware, advantages in Nidhogg are often fleeting, as new opponents continually spawn in your way. Use a variety of fencing maneuvers while armed -- lunges, parries, and even dirty tricks like throwing your sword. If swordless, press forward with punches, sweep kicks, dive kicks, rolls, and wall jumps."