This trick allows you to gain experience and weapons proficiency by selling loot from dead enemies. In order for this to work, leave one enemy alive, otherwise the quest ends. Exit out after killing almost all of the enemies and collecting all the sellable items desired. Reload your game and re-rampage in the arena. When you exit, the game saves all your information. Reload your game. Once you are in "the middle of nowhere" you will eventually get a Thunderdome/Arena type quest called "Circle Of Slaughter". You can go into the game, enter the arena, and slaughter everyone except one enemy. Note: There are three rounds, with the last one called" Final Round". Do not finish it if you want to repeat your work. You will earn easy experience, weapons proficiency, find loot, and can earn money from selling items.