I was thinking. What if Wally/Waldo was like a fugitive. Each Level would be you as a person looking for him from a third/first person perspective through a densely populated area. You would ask people if they had seen him and you would mark him on your map or write what they told you in your notes. Sometimes your leads would turn out to be lookalikes (eg. someone with the same hat or something), traps or something else that isnt Wally/Waldo. Not quite sure why Wally/Waldo would be a fugitive, but I thought this seemed kind of cool.