This is absolutely brilliant -- just the right level of difficulty to keep cats working it out, but also to ensure they get their reward. Ironically, we bought this for our really food-motivated and twitchy cat, to make her work for treats, give her somewhere to put her energy. But she simply cannot figure it out and dramatically collapses next to it. Our cat who operates strictly on vibes and who never seems to worry about food, on the other hand, will spend a good 20-30 minutes working methodically through the puzzles, and get ALL the treats. So not as intended, exactly, but great entertainment nonetheless!