What's Inside is the 13th episode of Blue's Clues from season 4.
The finding of a secret lost door gives us the opportunity to talk about things that are inside other things. For example, we play the Grocery Game with Mr. Salt and Mrs. Pepper. This involves placing various food items on shelves based on what's inside them. We also get to skidoo into a pull tab book, where we find many interesting things inside the tabs.