25 color bombs seems intimidating, but with 19 already made for you, so it’s just a matter of blowing them up and making 6 more. Work through the white blocks and give yourself some room to work with and work on making more color bombs. You can use the current ones to zap one color at a time to make it easier to form a color bomb.
Patricia Frederick’s Tips for Candy Crush Level 202
Look for the quickest match to get to and release a color bomb. As you start matching them with a candy or two try to get 2 color bombs released side by side to match them together as this is the quickest way to remove them all from the board. Remember not to overlook any special candies as you search for color bombs—they can be included in any 5 candy match to make a color bomb.