I think it's interesting to note VGC's data on this game and its predecessor.
At week 106, Brain Training aka Brain Age 1 was selling ~50k to make it 7th worldwide that week with a total of ~7.2M at that time (if you can believe their figures)
It is now (6th) at approx ~11M while More Brain Training (5th worldwide for week ending 5th january) aka Brain Age 2 is in its 106th week with approx 9M sold worldwide so far. It looks like these games will go on selling for a long time and 10.5M could yet be too low for this game
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At week 106, Brain Training aka Brain Age 1 was selling ~50k to make it 7th worldwide that week with a total of ~7.2M at that time (if you can believe their figures)
It is now (6th) at approx ~11M while More Brain Training (5th worldwide for week ending 5th january) aka Brain Age 2 is in its 106th week with approx 9M sold worldwide so far. It looks like these games will go on selling for a long time and 10.5M could yet be too low for this game