Abalone

Abalone is a freeware, open-source unofficial adaptation of a board game of the same name, implementing the original 2-player version. The players move up to three marbles at a time, setting them on pegs arranged in a hexagonal shape, trying to push each other spheres out of the board. The opponent's marbles can only be moved when a certain alignment is achieved, where the player spheres are in specific superior numbers like 3 to 2, 3 to 1 or 2 to 1. The game can be played against another human, or the computer with several difficulty levels. The initial position of the marbles can be switched between four configurations.