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Soundwave on 16 October 2009
The DS peaked its 2nd year in Japan too I believe (it was doing like an insane 100k per week every week there), but it has been a steady seller ever since taking off like a rocket in 2005. Had a bit a rough patch last year but has bounced back strongly since the DSi and better software.
Maybe these new kinds of consoles simply follow a different kind of pattern. They can get red hot and cool to just "boiling" hot lets say relatively quickly.
