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N-Queens is a very simple chess-based puzzle game. Try to fit as many (or as less) Queens as possible in a variable sized chess-board.
N-Queens has two modes of play. The Max N-Queens problem challenges you to place N queens on an NxN chess board without threatening each other. Word of advice is to start with a small chess-board first, and move towards the 8x8 one. There are many possible solutions for boards with N higher than 4.
The Min N-Queens problem is about placing the minimum number of Queens on a chess-board to threaten all squares on the board but not threaten themselves. Again, try with a small board and work your way higher.