After completing one match, check the Combat Sim Controls in the Armax Combat Arena to read the following e-mail:
At the Combat Simulator Control terminal, select "Spin Zone" as the map and "Elite" level enemies. The Spin Zone option is a bronze level prize, and the "Elite" enemies are a silver level prize—these will need to be purchased using your prior match winnings. The other settings are your choice—because most challenges are not mutually exclusive, you could conceivably finish other arena challenges at the same time, e.g. Citadel Arena: Thermal Clip Challenge and/or Citadel Arena: Medi-Gel Challenge.
After the match is completed, check the terminal for the following e-mail: