NullGee Connect Four - http://theproblemsite.com/games/nullgee.asp Drop playing pieces from the four compass directions to get four in a row in this strategy game for two players.
Connect 4 - http://www.geocities.com/ResearchTriangle/System/3517/C4/C4Conv.html Get four tokens in a row to win.
Four Balls Win - http://www.kielack.de/games/fourwins.htm Javascript version by Armin Kielack. Requires two players.
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