The Wobble Bowl is a level 1 puzzle; perfect for dogs that have never used a treat puzzle before. The NINA OTTOSSONn-slip base is quiet on hard floors and won't scratch or scuff floors while your dog playsFill the Wobble Bowl with your dog's kibble or favorite treats by removing the plug on the top of the lid and pouring the food in. Place the plug back in the lid, and let the games begin! Good for Interactive Fun.