Known for creating the best putty in the universe, Crazy Aaron has many other interests…like playing games! He created Ultimate Putty Challenge(TM) as a way to have even more fun with Thinking Putty®. This collection of 25 fun, fast-paced games has something for everyone with head-to-head challenges, creative competitions, and skill-based activities. Plus, it includes four exclusive Thinking Putty tins you won't find anywhere else. For ages 8 and up. WARNING: CHOKING HAZARD - Small Parts. Not for children under 3yrs.