ThinkFun a-ha! Brainteasers are designed to inspire special a-ha! moments for novice and seasoned problem solvers alike. A player will need all his brainpower for this one. The goal is to fit all four cubes into the box so they sit flush with the rim. Expert, Level 4. Launch date: 2010.
— Mary Porter Green, owner of Curiosity Zone in Ashburn, Va, told TDmonthly in a July 2013 survey that ThinkFun Brainteaser Puzzles were among her store's best-selling puzzles.