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An arena that is meant to be combined with the Mo' Creatures mod. has a jousting area and observation area. Give each player a horse and a sword and have fun.
The .schematic file format was created by users to store sections of a Minecraft world for use with third-party programs (specifically, MCEdit, Minecraft Song Planner, Redstone Simulator, and WorldEdit). Schematics are in NBT format and are loosely based on the Indev level format.
Please see the individual application above for usage instructions.