Cheat Codes:
Activate the following cheats by entering the corresponding codes during gameplay. Note: Repeat the code to disable it:

Toggle border display – noframe
Original?Bejeweled?gems – oldskool
Winter background – xmas
Space background – starfield
Colorless gems – blackandwhite
Green mode – greenscreen
Slow motion1 – slomo
Amber mode – amberscreen
Normal colors – normal
Gems switch colors – colorswap
Matrix?style background – network
Wavy background – nausea

Original mode:
At the menu screen, use the mouse to move in a clockwise circle on the Classic, Action, Endless and Puzzle mode selection buttons (in that order). Note: Make a circular motion while making sure each is touched by the pointer. Keep repeating the circular motion until the original mode game starts.

Unlock the following bonuses by performing the corresponding tasks:

Cognito levels – Complete all levels in puzzle mode.
Finity mode – Complete Endless mode level 280.
Hyper mode – Complete action level 9.
Twilight mode – Complete classic level 18.

Speed up Endless mode:
Open config.xml in Notepad and change the values of the last 2 lines, 500 and 150 to 1. After that, save and watch the game fly from one level to the next.

Classic-Style Gems:
To change the gems to the ones used in the original Bejeweled/Diamond Mine online game, type in the code “oldskool” anytime during gameplay.