Board Thread:General Discussion/@comment-29354964-20170629132056/@comment-29279962-20170714103809

But like I said, try to get past Ch.3 Moon first. Maybe farm some XP so u can upgrade ur Normal Cats to lvl 20. U need Lvl 20 Normals at least. ;)

Once u have ur Macho and Wall Cat to lvl 20, Metal Hippoe shouldn't be able to easily penetrate your defenses. U don't even need a critical hitter to kill Metal Hippoe once u have Lvl 20 Cats. Just swarm him. ;)