Gomoku / Renju
Gomoku and Renju - In-game title
The object of both games is to place five of your pieces in a row on a square, 15x15 board, with each player taking turns. In this implementation, the board can be reduced as small as 9x9. When playing against the computer, you can choose from eight levels of difficulty, move first or second (which defines your play in both games), switch sides, get a hint, take back any number of moves, review an entire game step-by-step, and watch the computer "think" or even play itself. Play against another human is possible, too, but the opening-move restrictions of Renju are left to you to enforce.