The Inventor deck is perfect for quick after-school sessions—my daughter pulls a card and just starts sketching. The Crazy Inventor story cards keep her busy longer since she has an actual problem to solve, and I like that the challenges work for both my 5 and 8 year old.
My 6-year-old asks for the Crazy Inventor cards at bedtime because she likes solving the little story problems before lights out. The cards themselves are sturdy enough to survive her tossing them back in the box, though I wish the box closed a bit more securely.