Code your autonomous agent and live watch it challenge other players AIs in deathmatch arenas, CTF maps or in physically realistic race simulations.
Your agent is a program that perceives it's digital environment, make decisions, and take actions to reach it's objectives. Tweak it, evolve it, refine it, script it, make it learn - whatever works; one goal : overcome the opponents with your code.
Perceive your environment and react accordingly !