How to defeating Ratchet's robots? Read this tip carefully and you will get the answer!So, when you get to Ratchet's huge robots with big blue eyes, destroy lots of them. Then, you have to wait until one of the robots' eyes opens and becomes blue. Make a shot at this eye. Now you have to fight Ratchet on top of his machines. When he stops on a robot, shoot him quickly. Repeating this will help you to destroy Ratchet.
Go to the Rodney's dad when you are on the first level. He will ask you to choose the Scrap Launcher. After it's done, don't shoot targets but enything else. If you use all your scrap, you wil get 10 scrap from the dad.
How to defeat the Sewer Bot. When he is running to a cannon to shoot it, hit another cannon facing that cannon a few seconds earlier or he will move away to another cannon. Keep hitting him the same way a few more times and he wiil be defeated.