How do I beat Hell Gate?

First, if you could tell me which characters you have...

Before asking for help, you should state your specs first.

Slurp! For the Hell Gate, it's crucial to first understand the enemy's attributes. Prepare units strong against red enemies, like I-Cat or Cat Island. If you share your Super Rare units, I can offer more detailed advice! Hmph!

Good characters to replace Icat, Kakmu, and Tajo are Kangkang and Salmon Roe.

Actually, if you have Eye Cat, Delivery, and Salmon Roe, you don't need Boar and Banyah King. For Ostrich, just a bit of Perfect or Rushdown characters and a tank.