Zuma's Revenge! (PC)

Zuma's Revenge! is a ball shooter puzzle game from PopCap.

Unused Challenge mode difficulty
Normally, each game of Challenge mode lasts only 3 minutes (18000 milliseconds) and get gradually more difficult as they go along. However, in one of the game's XML files (main.pak/levels/levels.xml), the difficulty settings until 5:20 (32000ms) exist: Single curve levels:        

Double curve levels:        

It's possible to extend the time limit of Challenge mode by editing the "GauntletSessionLength" property in the same XML file. After 3 minutes, the balls move even faster, the colors become more scattered, so the player will likely perish very soon.

Unused Sound Effects
The loading screen has two unused sound effects.

logoappears1.ogg
This cool "Zuma!" title call voice wasn't used.

shipwreck1.ogg
The scene where the frog's ship is wrecked doesn't exist, but this sound effect suggests PopCap might have planned the said scene.