Here is the Capture the flag edition of my pvp arena. Two teams and 3 flags per team. Who can collect them first.

Main rules:
Easy or normal difficulty without monsters.
Do not break or place blocks.
If you kill someone who had a flag, return it to its chest.

Game rules:
Capture the 3 flags of the other team. You must bring it back to base.
You are not allowed to enter the enemy base or the spawn point while in game.

For more info on the map itself go to
www.planetminecraft.com/project/pvp-arena-coliseum-city/