I forget if its 32 or 33, but its not passable through strategy. Rather, you need to keep trying it obsessively over the course of several days (you cant keep trying it all at once because of the equivalent of timers) until the stars align in the perfect combinations. I gave up without doing it. My wife, who plays a single game at a time with single minded devotion, eventually cleared it, but it took a bunch of days. If your strategy is better, it may only take you 20 tries over 4 days, while it might have taken her 40 tries over 8, but no matter how good your strategy, replays over days will be required.
Its a paywall for most folks, and the IAP is brutally expensive.
The game is cute and well done, but with nearly impenetrably paywalls only barely passsable without IAP (and then requiring many attempts and luck) and brutally expensive IAP, the game is only for folks like my wife. That said, you should be able to enjoy the initial levels no problem, and there is enough there to be potentially worth your while if you wont get ticked off later.