You can swap the current marble in the frog's mouth with the one on its back by right-clicking, allowing for better tactical planning.
Let's Play Zuma Deluxe: Part 1 - Introduction and Objectives
If you're struggling to get past the later stages of the Adventure mode, keep these tips in mind:
Unlike later versions (e.g., 1.0.0.5 or the Steam version), 1.0.0.2 does not have the visual level-select map. Instead, you progress linearly through levels grouped by "Temples" (e.g., Grass Temple, Moon Temple). This makes the version feel more raw and arcade-like.