Each of the Wonderful Robot Carnival matches emphasizes different aspects of robotics and different strengths or weaknesses. Robot Bottle Traction is a unique challenge where the robot has to get a basket loaded with PET bottles, or other goods, from the start line to the goal line. How they manage to do it is pretty much up to the robot's builder. Sometimes the results are surprising, and sometimes they are hilarious.
Bottle Traction scoring is based on mixture of time (how long it takes), load (how heavy the load in the basket is), and distance (how far did they get if they didn't manage to cross the goal line).