Dog Brick Interactive Game Dog Toy requires a dog to first dislodge the removable bones, then to push the sliding covers and access hidden treats. The level of difficulty for the Brick can be varied, depending upon the dog's experience and his enthusiasm for the game.
I now have two of these for my dogs. With a house of multiple dogs, you need to make sure that one dog can't lay claim to the game. So I have purchased a second one and I place them in different parts of the room. My dogs even act like if they move the slide back to cover the treat area a next treat might magically be there. So they keep moving things back and forth watching for the new treat:)