Frotz.NET for Windows Phone 7: Take Zork and the Grue with you on the road!
Take your old-school text adventures with you on the go with this port of Frotz. Supports all versions of the z-code files with the exception of V6.
If you have played the ZORK series by Infocom, you will know what this is and why to love it.
If not, there is something that you should absolutely not miss. Get the ZORK series here: http://www.csd.uwo.ca/Infocom/