Harry Tunnel is the third stage in Jail Break Tunnel.
3 Korys appear as the main threat when you attack the base.
Cat Lineup: Crazed Wall Cat, Eraser Cat (level 20+19 at least), Macho Legs Cat (level 20+19 at least), Crazed Sexy Legs Cat, Paris Cat, Crazed UFO Cat, Crazed Dragon Cat, King Dragon Cat (level 20+16 at least), Valkyrie Cat and Bahamut Cat.
Begin the battle, spawn Crazed Wall Cat and Eraser Cat for defense and use Macho Legs Cat, Crazed Sexy Legs Cat and other long-range cats, trying not to hit the enemy's castle.
When the player has maxed money capacity, spawn all cat units, (stop spawning Eraser Cat and Crazed Wall Cat because they have close range attacks, as Kory's attack will create shock waves and hit the other cats behind them. It's recommended for the player to use Dark Cat instead.
After defeating all the Korys, start spamming the Wall Cats.
Cat Lineup: Only 2 Meatshields (Crazed Macho and Crazed Wall), Bahamut Cat, A Uber Rare Cat, and fill the rest with cats with a range of over 300, such as Paris Cat, Macho Legs Cat, Drama Cats, Dancing Master Cat and Kasa Jizo.
First, spam the meatshields and slowly fill up your wallet. Then spawn Bahamut Cat. You have to get all of your meatshields killed once your units hit the enemy base.
After the Korys spawn, try to get a lot of attacks or knockbacks on them. When your damage dealers are all dead, spawn Bahamut Cat again near your base to finish them off. Then beware of the magnified Black Gories and Duches and push forward.
Cat line up: 3 Cheapest meatshield + Artist cat (optional?), Paris Cat, Drama Cat, Urashima Taro, Anubis, Bahamut, Unknown Cat (ANY other uber will be better).
Spawn several meatshield and paris to stay alive while upgrading worker cat to MAX. Keep enemies close to cat base. Then stack Urashima Taro, Paris Cat, Drama Cat (when enemies are kept close when start stacking, stacking is easier). Then spawn Unknown Cat, then Bahamut. When the cats almost reach enemy base, spawn Anubis. Hopefully your cats can knock back Kory and attack the base as much as possible (I managed to kill all Kory a few moments before the base was destroyed).
Strategy 4 (Speedy Units)
This strategy requires you to beat ItF Chapter 3 first. (I suggest you beat that chapter because its not that hard to beat when you have Max Anti-Alien treasures and some Ubers)
Cat line up: Crazed Wall (20), Ramen Cat (28+4), Lion Cat (20+13), Crazed Giraffe (20), Cat Eastwood (15), Crazed Sexy Legs (18), Akio Yabe (30), Jamiera Cat (20+11), Holy Valkyrie (30), Awakened Bahamut Cat (30) The ones on Italic are not important, can be replaceable.
First, stall the peons with anything other than Valkyrie and Bahamut, but dont go too much. You wanna save at least 7500 money to deploy both Valkyrie and Bahamut at the same time. When your have a lot of money, spam all the cats. When Kory appears, Bahamut should do a lot of damage to him. If Bahamut dies, stall the kories with all of your cats until you can spawn Bahamut again.
The Lion and Giraffe cats are for dealing damage while stalling the Kories.