UNAUTHORIZED PRODUCTION The information that BGG has on this item indicates that Block City is a non-authorized version of Quoridor. In this game, players are trying to move a pawn from one side of the board to the other. Each turn a player may move a pawn one space, and can add a wall piece to the board that blocks the progress between play areas. The winner of the game is the one that can first move his piece across the opponent's border.