Just browsing top free games in Japan appstore and came across this Engrish gem. It'll crack you up. Perhaps not, but it cracked me up with its funky Engrish. "Let's do the tap" is prompting you to tap the answer. Sees Again instead of See Again for instance. It's a free game called SeeChange and has 10 photos that transform ever so subtly and you try to spot the change. With ESPN Cameraman and EyeSpy both as "Spot the Difference" type games I can imagine this type would probably do well also. Akko ni Omakase! Brain Shock has IIRC over 300 of these "spot the transformation" scenes if you have a Nintendo DS. Unfortunately it never made it into English.