It sounds complicated, but of course, it starts out simple and builds up from there. As the game progresses, the Screetch moves faster, requiring you to drop gems in the right places quickly. There are also lightning gems that will clear out whole lines of the board and quite a few levels to ramp up the difficulty as you play along. The Screetch element adds a fun, new twist to the standard match three gameplay, and the graphics are pretty well polished to boot.
The game is available on the App Store right now for US $2.99, and the addition of online league play and trophies extends the playability a little bit. If you're a fan of match three games or just want a fun thrill to pick up and play for a few minutes at a time, check it out.