Tower of Hanoi $12.95 Rubik's Cube 3x3,4x4,5x5 $11.95 to $29.95 Age 8 and up Tipover Age 8 to adult $17.95 Gordion's Knot Age 8 and up $10.95 Tantrix Age 8 and up $6.95 USA Floor Puzzle Ages 6 and up $10.95 Human Anatomy Floor Puzzle Ages 8 and up $10.95 Credit Cards Accepted: Discover Card, MasterCard, Visa. Lawrence Hall of Science Members receive a 10% discount on all purchases. Your purchases help to support the educational mission of the Lawrence Hall of Science. © 2006 Regents of the University of California