The name might remind you of an unpleasant side effect of drinking the water in Mexico, but this Zuma’s Revenge won’t make you run for the bathroom. Instead, you’ll be glued to your chair, clicking away at ever-harder levels in four fun game modes.

The sequel to Zuma doesn’t change the fundamental gameplay: You’re a frog who shoots colored balls at an advancing train (or trains) of colored balls, trying to match three colors to make them disappear. The trains double back on each other, making it hard to get the right shot, and the balls just keep on coming until you rack up enough points to fill the Zuma meter. Then no new balls emerge from the start point, but you still have to clear all the balls on the board before they advance to the end point--or you lose.

All we wanna do is Zuma zoom-zoom-zoom.

To assist you, Zuma’s Revenge tosses in power-up balls, including three new ones not seen in the last game. You’ll get to explode parts of the train, shoot lasers, fire cannonball spray, eliminate all the balls of one color, slow down or reverse the train, and so on.

The frog doesn’t even stay fixed. In some levels, he jumps between two vantage points to shoot from. Other levels let the frog slide back and forth on a track. After every 10 levels you’ll fight a boss character, who showers you with obstacles that slow you down, make the balls wildly change colors, and more. The linear, 60-level Adventure mode doesn’t let you progress until you beat each level, but save points, free lives, and a generous continue system ebb the frustration.

Once Adventure mode is complete, you can play Iron Frog mode, and Heroic Frog, more difficult twists on the main game. Challenge mode offers one-off levels, where you try to achieve a set score within a time limit. The more you beat, the more are unlocked, 70 in all.

PopCap’s bright, tiki-inspired graphics and island music give the game polish, with the 3D balls seeming to glow against the backgrounds. We experienced a crash or two on our 2.4GHz Core 2 Duo MacBook Pro, but for the most part the experience was smooth.