CORE TIME is the third stage in Worker's Revolution.
A Mooth spawns at the beginning. After 15 seconds, Chief Peng, Dark Otter and CTO Seal will appear. Chief Peng will spawn throughout the battle and Zackie Peng spawns every 30 seconds. Another Dark Otter will spawn later in the battle.
Money is limited in this fight. A Mooth spawns at the beginning and can set you up with enough money for the rest of the fight if you can kill him. Butterfly Cat or Cataur can kill the Mooth fast enough to give you the edge before other enemies spawn.
When it comes to the boss fight you'll need some strong ranged units. Thundia, Pai-Pai and other anti-Red Uber Rares work especially well against the boss. Beware of the Zackie Pengs as they can burrow under your frontline and start killing your ranged attackers.