Hmmm... maybe. I actually think that NSMB will catch it at some point (its been out for a far shorter time, and isn't that far behind) - and whereas a few companies have put out their Nintendogs "look alikes", there isn't anything close to NSMB. (NSMB has outsold Nintendogs in Japan by almost 3:1) Be interesting to see :)
Gesta Non Verba
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