These codes are typed in IN the game, not at the main menu, and only work once per game. If you 'restart game' they will work again.

plzsutekcanihavemoretime -- 30 second bonus (max is 60 seconds)
pyramibread -- gives a hint to where to switch to line up three in a row -- INFINITE USE!!!!!

If you get stuck searching for a move, quickly hit "print screen" and pause the game. Then simply "paste" your screenshot into a graphics program and search for a move at your leisure.

To gain more time on the clock, choose moves that match 4 or more symbols at once. Combos that only combine 3-symbol matches don't seem to add to the timer. So to maximize your time, choose moves that line up at least 4 symbols, or better yet 5.

I would like to submit a tip for sutek's tomb, I have played a game a lot like it called "diamond mine." The main strategy of this game is to try as much as you can to get as many combinations toward the bottom as possible. If you can, concentrate on the bottom combos the whole game. That way, the pieces toward the top always change, you have a better chance at getting improv combos (those ones that just fall into place as a result of you moving things under them). You will detonate more bombs, and you will be less likely to find yourself stuck with no more moves.

~note from loki925: the beetle will detonate the bottom horizontal row when it reaches the bottom.