Hexic HD

The objective of Hexic is to rotate hexagonal pieces of various colours and clear them from the playfield by forming clusters or flowers. Clusters are formed when three pieces of the same colour touch each other. Pieces above the cleared pieces fall, potentially forming more clusters and causing chain reactions, and new pieces appear at the top of the playfield. Bonuses are awarded for clearing more than three pieces at a time, and some pieces contain bonus stars, which yield extra points and can clear larger groups of pieces depending on how they are cleared.
Source: Wikipedia, "http://en.wikipedia.org/wiki/Hexic," available under the CC-BY-SA License.