Sela pawzle is a great addition for increasing the number of combinations on your base. Sela is a pawzle that takes up 2 spots on the base and requires unlocking the slider before lifting the lid to uncover the treats hiding in the compartment beneath. The slider can be unlocked with a dog’s nose, tongue, or paw. You can fill in the compartments with treats, regular dog food, or even peanut butter for your dog to find.