If your children are into games and you have no idea what they are talking about then I highly recommend you explore this site. http://www.everybodyplays.co.uk/parents-guide-to-games. A really good section on the site is The Game Finder - you can search by platform and age.
Click here to view http://www.everybodyplays.co.uk/game-finder/
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Source: www.everybodyplays.co.uk/