Bits and Pieces - Mini Wood Brain Teaser Set of Four-Classic Designed Dark Wood Stain - Wooden Brainteaser Puzzles & Fun Gifts Great gift for any puzzle enthusiast! An ingenious collection that will both amuse and infuriate. Four wooden brainteaser puzzles for adults. Recommended age range 13 years & up. The largest of the four puzzles is the cube, which measures approximately 1.75" x 1.75".