Quoridor
very simple rules:
1.- get to the other side to win
2.- move your pawn or put a wall
full rules explanation: http://en.wikipedia.org/wiki/Quoridor#Rules_of_the_game
Download: http://martijn.van.steenbergen.nl/projects/quoridor/ Java and OSX versions
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One of God's own prototypes. Some kind of high powered mutant never even considered for mass production. Too weird to live, and too rare to die.