At its heart, retains the addictive formula of the original: you control a stone frog that spits colored spheres into a moving track of marbles. Your goal is to create matches of three or more of the same color to eliminate them before they reach the mouth of the skull.

Where Zuma's Revenge truly distinguishes itself is in its arsenal of new features. The original had simple special balls (slow, reverse, explosion, etc.) that dropped from the chain. Revenge expands this into a dynamic, risk-reward system.

I adore NCSS and PASS. I have been using them for 20 years now.

Mario Martinez Gonzalez, MPH, FEE, MD, Universidad Nacional Autonoma de Mexico

Your support is always amazing. I also run [another statistical software package] and on a support / admin basis you guys are way ahead.

Neale Penman, Researcher