Ok we need some more ideas for arena hazards and challenge types and obstacles. I can think of a few now but need loads more ideas.

Obstacle Course / Gauntlet:
Unlike the robot wars gauntlet where there were 3 routes to chose from with only 1 major obstacle each route this course will have one route with 4+ obstacles (still undecided on amount of obstacles and what ones to use. You will have to drive towards yourself in parts of the course.
See-Saw Ramp 1 - 200mm wide solid see-saw ramp
See-Saw Ramp 2 - 200mm wide see-saw ramp made of 2 x 75 wide ramps that pivot independently with a 50mm gap inbetween
Rumble Strips - A row of 3mm high steel strips.
Wall - Break through wall of objects such as Barrels, Boxes, Blocks etc.
Box Push - Push a steel box out of the way or down the pit to get past.
Score - knock a ball into a net (maybe the final obstacle, Score a goal to finish the gauntlet)

Sumo:
Competitor vs Competitor
Competitor vs House Robot
Sumo Platform - A raised platform approx 700mm - 800mm dia

Tug of War:
2 robots connected by a wire or rope, first robot to pull the other robot over the centre line or the robot that pulls the other robot the furthest in the given time wins.

Joust:
2 robots compete in a pushing game. 1 robot either end of a narrow ramp. first robot to push the other robot off the ramp or the robot that pushes the other robot the furthest in the given time wins. (May have a special see-saw joust ramp just for fun.)

British Bulldog:
Robots start at one side of the arena and have to get to the other side without being caught by the house robot. The robot that travels the least distance across the arena is eliminated, unlike robot wars where if all robots made it to the other side the last robot to the other side would be eliminated we will have it so if all but one robot makes it to the other side without any problems the remaining robot has 10 seconds to get to the other side. If all robots make it across the arena with no problems the challenge will continue with all robots having to make it back to the other side, This will continue untill one robot remains.

Bowling:
A robot will knock a metal ball into a set of pins. Dont know what to use as the pins. They want to be industrial looking not like propper bowling pins.

Pinball:
Score as many points as possible by hitting/using objects/obstacles.

Football:
Dont know how to go about this yet.


Arena Hazards:
Flipper
Pit
Spinning Platform
Spinning Weapon
Spikes
Hammer