To unlock the full game—unlimited time, Gauntlet mode, and all the temples—users had to purchase the game online. Upon purchase, the vendor would email the user a unique (sometimes called a Registration Code or Product Key).
Some third-party tools (e.g., "PopCap Key Finder") scan your old hard drive’s registry and temp files for cached order numbers. Use these at your own risk. Zuma Deluxe 1.0 Order Number