Ogre Island is a special stage available on the 21st of every month if the player has previously completed all Crazed Cat stages. Completing this stage unlocks the True form of Crazed Fish Cat. Using Cat Food to continue the battle is not allowed in this stage.
At the beginning, one Manic Island Cat is sent, with many Crocos as support. Soon after, 3 Manic Islands and a few more Crocos are sent. This formation repeats until the base is hit; then, a Berserkory and 6 Manic Island Cats appear! After Berserkory dies, the Manic Island Cat spawn rate increases even further. Brollow is also occasionally sent in groups of 3.
- Use a similar strategy to Fish Hell, but replace the Crit Cats with Dread Pirate Catley or another strong anti-Red Cat. More DPS is needed against the tougher Islands.
- Using three spammable Cats makes Berserkory more likely to miss. Stack Crazed Dragon Cat, King Dragon Cat, Macho Legs Cat and Manic Macho Legs to kill the Berserkory quicker.