This generally works 85% of the time. Start in hard mode, and place a rocket launcher at the top left corner of your castle (so corner touches corner). Next place a tower to its left. Make this tower a bag thrower ASAP. After a couple rounds place another tower to the left of the bag thrower and another to the left but up one spot.
Then put a tower two spots above the original rocket launcher and finally one to the left of this one. You will have created a sort of pathway. Here is what each tower should be as you keep earning “parts”. The original rocket launcher. Above this another rocket launcher.
To the left of this another rocket launcher. To the left of the original rocket launcher a wind blower and upgrade one time (for distance).
To the left of the wind blower create a net thrower. To the left and up one make a sludge thrower. The score should be 7,395.
Watch levels 17 and 20, you may have to click on a toy getting close to your cookies. Enjoy! – lafanlv
Hi! Just thought I’d like to add a bit of info… If you start the first wave with two parallel cork throwers right at the toy box you will never have a toy get close to your cookies in the first two rounds because the first round is always destroyed by the two cork throwers and you can have both bag thrower and rocket by the second round. It increases your chances of success. :3