You cant always get them 100% free but you can download them for a 60 minute trial. I would definitely recommend buying them though because you will get really attached in 60 minutes
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it is possible to get a free Nancy Drew PC game online, for details of the games and how to download a free full version game see the related link below
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One can find Nancy Drew video games online on several websites. Some of these websites are Big Fish Interactive, Her Interactive, Game House and Shock Wave.
You can play a free trial of one on bigfishgames. You can also download free trials of a lot of the games from bigfishgames.com or buy the downloadable full version of each nancy drew game for 2.99 on bigfishgames.com. You can also play one mini game from selected nancy drew games on herinteractive.com(the website for the makers of nancy drew games.) Hope this answer was helpful.
you can play it at herineractive.com.
Nowhere
Yes and no. There is a program called CrossOver (available as a free trial from the related link below) that can run SOME Nancy Drew games. Others just do not work.