It's a 3D puzzle and a building set in one! This follow-up to the best-selling, award-winning Mental Blox game is specially made for younger players. Kids as young as four will love solving 28 puzzle challenges by stacking the colorful, engaging blocks into the right combinations. It's the perfect way to encourage early development of critical thinking and logic skills.Details:For 1 or more playersFor ages 4 and upContents:28 double-sided puzzle cards8 puzzle blocksPuzzle tray (6.25" x 6.25")Activity guide