All of us suffer from occasional mental block, but Duncan has turned on its edge with the new Mental Block brain twister. With alternating turns, simply be the first player to connect 4 pegs in a row, and you win! Fun for 2 to 4 players, easy to learn but a challenge to win! Over walls and around corners; use all 6 sides. More fun than 2-dimensional games, Great for kids of all ages, Multiple game variations 2x CDU's 5x Duncan Mental Block's per CDU