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Also, theres some things about that picture that it doesn't seem logical a faker would think of...such as the baloon in the teaser screen, a big part of the original Gumshoe...
Please tell me how you know this.  Seeing as how this title never came out of Japan and is quite obscure, I find it hard to believe that you actually played the game, or knew someone who played the game.  I believe you found out about the balloon from (surprise!) the internet- the same exact internet that the potential fakers have unlimited access to! 
I am GumShuPersonally, I don't know what to think about this one.  If it's a fake it's extremely well done, seeing as it's the only "leak" that I've ever thought had a serious possibility of being legit.
Edit: Just so you know, those other options under the picture are what seems to be "High Score," "Discuss," and "Review."  That sounds pretty damn good to me.  Also, I don't think that thing on the right says "Game Even" or "Game Over."  Either way, it could be an e-mag or it could have something to do with the download service...