Flock! is an interesting, inventive, and mostly enjoyable puzzler, with its own style and challenge. On the one hand, the fifty-five levels plus the extras you might go through the effort of building and/or downloading, can take quite a while to complete, especially if you are a completionist who wants to earn every gold medal and top time. On the other hand, the asking price for Flock! is $15, which might prove to be the game's defining factor for deciding whether it's worth, err, flocking into.