My brother, who is 2 1/2 years old, absolutely loves this game. Whenever I need him to calm down or when he's bored, I'll give him my phone and have this game running. It can keep him busy for quite a while, not to mention it's possible positive affects on him. But I must say, the app itself is quite well made. Even for a 2 year old, he has no trouble accessing any of the levels by himself. The design is simple and understandable enough for anyone to operate it, and I think this is one of the best parts. I don't need to watch him while he plays and he doesn't need my help and doesn't bother me when I'm doing something else. Speaking of, I have not encountered any glitches or bugs that can change or alter gameplay. The app itself has never crashed, and is very stable. Battery usages is mild, but I think it shouldn't be too bad for less than 20-30 minutes of use. The art style is also great. It captivates my brother and really makes him happy to see the little animals and objects. The font is easy to read and the puzzles are fun to solve. All in all, this is a great app that should not be overlooked.