BotArena is a programming game. The objective is to program a robot AI; you will code what the robot will do every turn, and what the robot will do when certain events happen (like hitting a wall).
Your robot will battle against other robots, programmed by other players or by yourself. For every round where your robot is the last robot alive, you will get 100 points.
Check the wiki to learn how to code your own robot and how to configure the game.