You may remember this post from the other day about a detail I noticed in a photo from the book. Turns out Greg Hartley, a long time Sesame Place employee, had one of these and let me see it in person. It was made of metal and bolted to the frame that went around the computer monitor. Ernie's said "7 and up," Grover was "under 7."
This showed which computers played games for what age range.