For all chapters - Simply send out few Tank Cats/Wall Cats, while they are doing their job, upgrade your Cat Wallet to max level. Sadly, your meatshields won't be able to kill Jackie Peng and Gory. So that's why you would want to considerate on spawning Bird Cat/Ufo Cat with Gross Cats/Sexy Legs Cats when they come. You will get quite rich from them, so why not send out all of your units at once? Poor Sir Seal, he won't even stand any chance. Pretty soon, however, Le'boin will spawn. Without a doubt, you will want to spawn meatshields, Gross Cats/Sexy Legs Cats and Titan Cats/Mythical Titan Cats.If you have Mythical Titan Cat, Le'boin will be a piece of cake. If not, don't worry, you will kill him eventually,
When you kill Le'boin, Kang Roo will be very easy to kill. After that just progress toward the enemies base, and do what you have to. Squire Rel will try to stop you, but her efforts will be in vain.
if you keep on spamming the cow cat, ninja cat, tank cat and macho cat you will be fine, jackie peng and gorey can easily be deafeated with ninja and cow cat, and the meatshields will deal with Kang Roo, the best part about this strategy is most of the time you wont have to deal with with le'boin due to this strategy cheesing the system.