How the heck do they figure these out so quickly?! I'm so amazed. I have some level 1 and level 2 toys, but honestly, if you have a smart dog I'd just skip the easy ones and go straight to 3! This was for a VERY smart dog, and she figured it out in less than 3 minutes with none of the easier levels for practice. I could see her working it out, it was great entertainment for me, as well!