There are a few wordgame problems in the "Mactech" magazine programmers
challenge page: http://www.mactech.com/progchallenge/

These seem the most interesting ones:

Clueless Crosswords:
problem:  http://www.mactech.com/progchallenge/9712Challenge.html
solution: http://www.mactech.com/articles/mactech/Vol.14/14.03/Mar98Challenge/

Boggle:
problem:  http://www.mactech.com/progchallenge/9805Challenge.html
solution: http://www.mactech.com/articles/mactech/Vol.14/14.08/Aug98ProgChallenge/

Ghost:
problem: http://www.mactech.com/progchallenge/9910Challenge.html

Word grid:
problem: http://www.mactech.com/progchallenge/9905Challenge.html

Playfair cypher:
problem: http://www.mactech.com/progchallenge/9909Challenge.html

Unfortunately Mactech holds the copyright to the submited entries
and will not allow us to keep a backup copy here, so you'll have to
go to the original source and just hope it's still there...

Another programming competition (free from any copyright
restrictions) can be found in ../potm (Programmer of the Month)