Peg Solitaire
A board game played with pegs: in the classic mode, there 33 positions and 32 tokens. The object is to remove the pegs but only with horizontal and vertical movements. To solve the game, leave only one piece on the board in the center position (which was initially empty). In reverse mode, there is initially only one piece on the board. With movements, tokens are added so that only one position is vacant on the board.