Mortal Kombain is what I call a "null-mod" – a set of rules which requires no modification of the original game (Farming Simulator 2013, though previous versions with multiplayer support may work as well).
In four words, this is front loader sumo fighting.
In a bit more details, it plays as follows:
- Get two players online.
- Get them two front loaders (models and "weapons" at your discretion, trying different combinations is actually a fun thing in itself).
- Let them meet at the bridge near the port.
- The one who tips the other into the water wins!
Actually, watching this video should be enough to get the concept.
Like it? You can see more here, or get Mortal Kombain apparel on Cafepress. And, of course, you can play it yourself. All you need is a copy of Farming Simulator 2013 (or, well, two copies if you want to play with a friend).