Review by DigitallyDownloaded:
"Really, for $1, you can’t go wrong with this game. It’s entertaining, well-balanced challenging and addictive – just like all good puzzlers are."
4.5/5 Stars

Cluster Master is a new puzzle game by legendary game designer Dr. Reiner Knizia.

Fit the hexagons to build clusters of the same color. Larger clusters will give you more points. Play against the clock, or with plenty of time to think it through. Compare your scores with friends through Game Center leaderboards and achievements.

There are 4 game modes in total. One is available in the free version, and 3 more can be unlocked through a single in-app purchase.

Special bonus-gems that work in all modes can also be bought through in-app purchases, or EARNED BY PLAYING in-game. You have the option to buy bonus gems, but do not have to.