ThinkFun a-ha! Brainteasers are designed to inspire special a-ha! moments for novice and seasoned problem solvers alike. Can you “shoot” the arrow out of the front of the tray without removing the three planks? Hard, Level 3. "[It's] another brainteaser to add to ThinkFun's collection of best-selling brainteasers, which teach pattern recognition, abstract thinking and problem solving," Edoardo Kulp, Marketing Manager, ThinkFun Inc., told TDmonthly. Launch date: 2010.