Enter any of the following cheats anytime during gameplay to activate the following effects.
blackandwhite-All gems lose color
normal-game returns to normal colors
greenscreen-everything goes green
amberscreen-everything turns amber
slomo-everything goes slow
colorswap-gems switch colors
network-matrix style background
starfield-Switches the Background to Space
noframe-Hide/Show the Game Borders
xmas-Switches Background to an ice-type planet & snows
Beat all the levels in Puzzle Mode to unlock Cognito Mode.
Reach level 280 on Endless Mode tp unlock Finity.
Open config.xml in Notepad and change the values of the last 2 lines, 500 and 150 to 1. save and watch the game fly from one level to the next.
Reach level 9 in Action Mode in order to unlock Hyper Mode.
To enter Original Mode, you must move the mouse in a clockwise circle around the four mode select buttons on the menu screen (Classic, Action, Endless and Puzzle in that order). It is not enough just to touch the buttons in order, you must actually describe a circle shape with the mouse. You may need to do it several times. Eventually, however, an Original Mode game will start. Original Mode is the same as Bejeweled 1; Classic Mode with no Power Gems or Hyper Cubes.
Reach level 18 in Classic Mode to unlock Twilight Mode.