I forgot the arena.

It is a massive 15m x 15m square arena, partially inspired by Martijn's near-wall-less arena in the fact that the walls are only 10cm high. There are 4 CPZs in the corners, with the walls raised to 1m from the corner to the edge of the red line which marks how far the house robot's domain is. There's a 1m x 1m pit in the middle of the arena, and the bumper to release it is in the southwest corner. the northeast corner is always occupied by the Guardian, our refbot, and the other 2 corners are occupied by two of these house robots:

Battleaxe
Major Damage
Gripper
Shunt
Matilda
Magnavox
Sgt. Bash
Dead Metal
Sir Killalot
Mr. Psycho
Growler
Cassius Chrome

There is no drop zone, no floor flipper, and no hazards, other than the pit.

And in the vain hope of trying to get competitors now, is everyone too scared to face Samuel for the title?*

*Note: While I know this isn't true, I'm using it as a psychological ploy to convince people to enter.