I did have one minor gripe when Urbo first launched, in that it was sometimes hard to discern the exact level of particular buildings, but a recent update has fixed this so you can always see exactly what's in play. So really, I have no complaints about this whatsoever. Neat! If I was being nitpicky, I'd still say that Dorf is probably the more nourishing puzzle game for me, what with its quests and discoveries and near-endless map sizes to play about in, but if you're more of a cerebral Threes-type, then Urbo will fit right into your regular puzzle regimen. It really is a lovely little thing, and a very chill way to while away a dark and rainy afternoon.