Play as the Ironheade against the Drowning Doom on the "Feeding Area" level. Make two Razer Head squads and a Head Banger squad. Place a rally flag on the fan geyser to the right and have them go there. When they meet enemies, help them. Continue making troops and use your solos. After getting the geyser, have them attack the enemy geyser directly next to their stage. Consider having some of your troops attack the enemy geyser and the new troops to attack the stage, or vice-versa. This should cause the enemy to panic. Continue helping them with attacks and solos and return to the geyser on the right where your rally flag is located and have your new troops go to the enemy stage or geyser. Leave the rally flag there; if you place it near the enemy stage they may run through the middle where the worm can slam them. After awhile, have them all attack the geyser if it is not already destroyed. At some point there will be no enemies in sight. Use this time to accumulate fans to upgrade the stage. Try to upgrade the stage only once. Afterwards, just make fire barons. After taking the enemy geyser, have them all attack the stage.