The key is to make sure you don't fire too many in at once, as each addition extends the line by one, inching it ever closer to destruction.
It's a twist on the match-3 games like Bejewelled, just not on a grid. You have to stop said balls disappearing into the demonic gullet by firing additional spheres into the snake. His battles take the form of long ribbons of coloured balls that snake along a track towards a gaping maw of death.
There are lots of mentions of the word Tiki, too, which is always nice. The premise is that your hero, a frog, is shipwrecked on a monster-infected Hawaii-like island and, in his attempts to explore his surroundings, has to do battle with the denizens of the jungle. It's also safe to say, though, that it doesn't have that all-encompassing joy factor of Peggie delivered, as, surprisingly, it's a little bit user-unfriendly. Zuma's Revenge is just the next game off their conveyor belt of fiendishly addictive, quality casual titles. Sure, they've had a few partial misses in the past, but since Peggie exploded, they've just nailed that treble 20 each time. It Doesn't Seem to be possible for PopCap to release a bad game.