I haven't been as consistent with it as I should, but Mario is doing great with his enrichment toy. A few times he's gotten his craisin bit out of every well with no additional encouragement from me (previously if he lost interest I'd tap the toy and call him back). He often gets "stuck" once he's pushed the disc all the way away from him (much harder for a bunny to pull it back towards himself), but I've been impressed when he figures it out. This is still the easiest level, but I'm thinking with a higher value treat I could probably graduate him to level 2 soon.
Paws work well for digging out the treat!
The nose knows.
Pre-loaded "Monday Mario" for your continuity loving pleasure.