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I was really surprised while "browsing" through an old BYTE issue (December, 1980).
There was an article about a MICROSOFT ADVENTURE which runs on a TRS-80 and an APPLE II (later, there was also a DOS version).
Even though it's not the best adventure, there is an interesting side note.
It wasn't invented from Microsoft, it already existed for a PDP 10 and/or 11/70 (see notes from the author in the below attached PDF).
So it can be the first rip-off from Microsoft (and *not* MS-DOS).
I am not sure at the moment, that it's identical to "Colossal Cave".
If someone has further information about this and the creation history, please give me a hint.





Ensure to take a look into the article (PDF) - >HERE< !

There is a nice page about the original "Colossal Cave Adventure".
Just visit http://www.rickadams.org/adventure/ ...

And finally, there are a few CP/M-80 ports also, just download >this archive< (Mike Goetz made it possible).

P.S.:
Meanwhile I saw there is another page which describes the creation history, but they didn't talk about a "rip off" or a copyright violation.
Visit http://www.filfre.net/2011/07/microsoft-adventure/ for more details.
Also, there is a page about the first version of this "Cave" adventure, written in Fortran. Just take a look at http://digitalhumanities.org/dhq/vol/00 ... 00009.html too.