Chaos Lagoon is the fourth stage in Swimming Cats.
- Several Duches are spawned throughout the battle.
Save up money until to get to a Level 8 Wallet. Spam meatshields and some stronger cats such as Dragon Cat and area attackers like Paris until Duche, Metal Hippoe and St. Pigge the 2nd cannot break through the defense. Any Cats that can attack with Criticals such as Jurassic Cat or Marauder Cat, quickly use them for the Metal Hippoe as he can block all Cats' attacks. Do not stop spamming meatshields until the end or else the multiple enemy units will push through. Make sure to use a fairly leveled Valkyrie, or any Ubers that can attack quickly. If Bahamut is available, use him to deal heavy damage to the Pigge and Duches, but be careful, as the Metal Hippoe can cause him to completely waste his attack on it.