Zombie Heads - a matching game

In Zombie Heads, you need to match up zombie heads as they are tossed into a garbage can. When two heads are matched, they explode, making room for more. The zombie heads fall at an increasing rate of speed, threatening to overflow the trash can. If they reach the top, you lose! As you destroy more and more zombie heads in a row, you unlock achievements, and increase your bonus multiplier. In a ti…