This level is very difficult. It's highly recommended to bring the Rich Cat power up and Treasure Radar if you want Li'l Nyandam (make sure you know you're going to win though!) For units, it's also highly recommended to have maxed out The Crazed Cats and True Forms at (+15) or higher.
Don't bring Ururun Wolf here, because if she knocks back Le'noir or Wall Doge , all your ranged dealers will walk into the range of Li'l Nyandam and get insta-killed. Just like "Cave Fillet " (where when you knock back Teacher Bun Bun , Nyandam may follow-up and kill your cats).
Li'l Nyandam makes his first appearance here as a boss.
Teacher Bun Bun appears for the sake of gathering money early enough.
Heavenly Hippoes spawn with only Bun Bun, appearing as support.
It's possible to stall Teacher Bun Bun using constant meat-shields until you're able to summon Bahamut Cat, but clearing the first few Heavenly Hippoes is the main problem. For Li'l Nyandam , it is recommended to bring anti-red Cats such as Island Cat, Crazed Whale Cat , Dark Cat etc.
If you have Super Galaxy Cosmo, then this stage will be very easy as it out ranges both Le'noir (Black) and Li'l Nyandam (Red).
(Note: This strategy is probably only usable by people with very high level units)
Lineup: Mohawk Cat, Crazed Wall Cat, Eraser Cat, Jiangshi Cat, Sadako Cat,
Immortal Yukimura, Divine Thundia, Awakened Bahamut Cat, Catman, Jamiera
No power ups required! (unless you want Treasure Radar)
At the start, level up your wallet once. Next, start sending out some Jiangshi Cats, but not too much. Also start sending out some C. Walls, and, when possible, send out Sadako. Make sure to watch your money, you need to have money as soon as the Metal Doge dies. Once it does, send out Yukimura and spam some meatshields, making sure to upgrade your wallet as soon as the Hippoes die, but leave enough for Awakened Bahamut. Once Bun Bun is dead, you can technically relax a little bit. Make sure to send out meatshields, but don't overdo it. Jiangshi Cat is important, as he can attack the metal doges frequently. Start sending out Thundia or Catman, and send out Jamiera as much as possible. Try to have your big hitters arrive when a metal doge dies so you can slip in, or have Thundia/Catman fight the Shy Boys. Repeat as much as necessary, eventually Metal Doges will stop coming out and you can stall and focus on power. You will slowly take out everything, and then you will win! If you are lucky, you will get Li'l Nyandam as well.
Just use 3 meatshields,crazed gross (or manic),awakened bahamut and Pai-pai. Pai-pai easly kill nyandam and outranges le'noir. Works on 2 and 3 stars too