I haven't played Candy Crush in a while but at one point I did and had mastered every level. There are numerous videos and tips on how to beat certain levels especially level 266. All I can give you for advice is to keep trying. I would suggest starting from the bottom and matching them as it causes the others above them to fall down and often match themselves up. Make sure that you use your extra moves and lollipop hammers wisely as they are very hard to get and you are limited on how much you can use them. Here is a video on how to beat level 266. Good Luck!!