These are again older photos, but they are from the first day I increased the difficulty level on Mario's enrichment toy. At this level, the treat is under the blue plug and he has to topple it over to get to the good stuff.
I thought this would be easier than having to push around the big blue disc on the first level, but Mario actually needed a lot of encouragement to find all the treats. And I used a very high value, aromatic treat -- banana!!