Just found videos of the Fetch with Ruff Ruffman season I worked on Youtube. I worked on season 4 field production, studio, props, and finale set dressing.
In this video the last two contestants are facing off. Their final face-off challenge is the electromagnetic spectrum stacking challenge. I love seen games/props that I made translated into the cartoon portion of the show. I was also in charge of cheesing up Studio G. Too. Much. Fun.
UPDATE: Looks like the video was pulled when episodes where made available to purchase on demand. You can now get purchase the episode or season pass: