All battlefield sports operators get access to the 'Battlefield Royale games handbook', with a detailed explanation of how to set up a game, and the mission briefings. This handbook is provided free of charge as a pdf download, and contains a wealth of knowledge straight from the people who have been running Battlefield Sports games for decades. 
The following games have been created to be played in the Battlefield Royale theme. 
Be the last man standing on the battlefield
Outlive the other teams in the ever-shrinking safe zone
Capture as much flags as possible before time runs out
Dominate the central location on the battlefield
Steal money from the bank, or from the opponents
Eliminate the other team while avoiding to get yourself or your team-mates killed