These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Nightmare Fuel: How the contestants are surgically prepped for the game. The legs from groin-level down are cut off, with or without anesthesia, then their skin is stripped off in a method similar to sandblasting. Next, a sheet of malleable metal is grafted onto in place of the skin, especially since the arms are how they move around. Afterwards, vacuum-esque suckers are attached to their hands, to allow them to climb walls and pick up items. Presumably the cannons are attached where the legs would be. Barring the final sentence, that was paraphrased from the manual.