Teeqoz on 24 February 2015
Keep in mind that the database for old games are very lackluster. For example iirc, one of the Sly Cooper games isn't even tracked. Basically take these numbers with a grain of salt.
And I was actually surprised by the same thing the OP was surprised about. Always thought R&C 2 or 3 would have been the bestselling ones in the series.
