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1. When will it fall out of the top 50? Probably not for atleast another two years. 2. By then it will have sold another 1.2 million copies i thinking, bringing it to about 4.7 million sold. It could have enough there after to get past the 5 million mark. 3. No idea 4. I prefer the game to Big Brain Academy, an area where me and my mom differ. Big Brain Academy is fun for a while, but after a while it's like taking continuous IQ tests. Brain Training has Sudoku and I get more enjoyment from the the training exercises than BBA. I haven't played it for a while though. It doesn't have a ton a reply value but definetly fun while it lasts. 5. Brain Training and it's sequal have probably moved more systems than any other DS game in Japan. NSMB sold to Nintendo fans who would have bought a DS anyway, while Brain Training has been key with causual and non gamers, particularly women gamers.