Archived from groups: comp.sys.ibm.pc.games.strategic (
More info?)
Raymond Martineau <bk039@ncf.ca> wrote:
> Don't be suprised. I've seen sites that advertise similar keys of
> "1111-1111-1111-1111-1234" and other patterns that have been known to work.
>
> Most of these keys involve a simple addition of numbers to verify that they
> are accurrate - if 1111 + 1111 (etc) somehow adds up to 1234, the key is
> considered fully valid.
The good ones have two sets of check digits. One gets you past the
title screen, one kicks in when the game is 3/4 done.
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