Good to pass time if you in flight mode. Too many ads, but hey is free However levels seems to be random, no challenging at all, is just same thing over and over again. No time or move count either- Devs maybe add those two things at least it will feel more competitive .. I would give 3-4 stars then. As it is for now it seems as if this is one of those "ad-infused revenue generator" for devs.