Bandai evidently sells a game-in-a-controller compilation (you know, the kind that hooks up directly to the TV set) that includes classic Taito arcade game Gladiator, also known as Ohgon No Shiro or Great Gurianos. Moreoever, it comes with hacked gameplay modes!
Google failed me. The lazyweb node that finds this for me will win a prize! It won’t be a very nice prize, but it will be a genuine gadget. If you’re curious, see footage of the original unhacked game. It was fun!