I'm always keeping my eye out for the controller that was used for Whac-a-Critter (aka Mallet Legend), and found an interesting description on Amazon. "Designed for years of bashing and thrashing, the Smash Controller is incredibly intense with Realtec's Whac-A-Critter and Video Simon." I can't find anything on this Video Simon. Considering there is nothing on SEGA Retro I'm assuming it's unreleased. Did a prototype ever exist though?