I believe this would be the correct copyright term for a game made by a game company.(every body who made it works for the game company so it should all fall under work for hire). Instead of the usual death + 70.

http://en.wikipedia.org/wiki/List_of_countries%27_copyright_...

95 years from publication or 120 years from creation whichever is shorter (anonymous works, pseudonymous works, or works made for hire, published since 1978)

Yes, but not for a long time.

Same as for anything. In the United States there's a chart for looking up rights and determining if a property has reverted to the public domain: http://copyright.cornell.edu/resources/publicdomain.cfm

1923 is the base-line year for any works with a proper copyright notice. 1977 for any works at all, as the requirement for a notice or registration was eliminated.