The first priority is to unlock and destroy the bombs before they count down to zero.
Once that's taken care of all you need to do is look for colour bomb patterns..
Just keep making colour bombs and wraps.. Stripes are OK but only if matched with a wrap to cause maximum damage.
When you switch a colour bomb don't worry what colour candies you switch with. I try to use the colour that there are most of on the board.
The more you remove, the more chance of cascades which will keep going and collect the blues you need.
Keep a check on the numbers of blues you need.. I have found that for maximum points I try to keep the numbers of blues needed to around one tenth of the moves remaining, that way you don't finish too early and can get the most points.. Scores in the millions have been achieved on level 666. The level has been changed slightly and waffles have been added which can get in the way a little, but it is still a very doable level. Below is the latest video by Tzvi Marcu
If you've got this far you don't really need hints, but on this one just maximise damage ... of ANYTHING ... just make specials, especially colour bombs and use them on blues (if lots!) or any other colour if not many (as blues will partly back-fill) ... bomb+wrap is really good, bomb+stripe not so much as it mucks up the board. DON'T focus on blues, just make good specials (colour bombs or wraps) when you can, fire off a special (ideally in combo) when u can't make one!
