Stratego is a strategic board game featuring a 10 × 10 square board and two players with 40 pieces each. Pieces represent individual officers and soldiers in an army, though the game is in all other respects an abstract strategy game. The object of the game is to find and capture the opponent's Flag, or to capture so many pieces that the opponent cannot move at all. Players cannot see the ranks of each others' pieces, so misinformation and discovery are important parts of the game.
Read more about the game at boardgamecentral or at wikipedia.
Play Stratego online free here.
The source of the image is http://en.wikipedia.org/wiki/Image:Stratego_Board.jpg.