"Moneymaker: Take Sky Dragon as your first Titan. Take Popo, Kara, and Viegraf, and Goblins, Dwarves, Succubi or WereTigers, Dragon, and Orangutangs and Mighty Guardians. Start the 1st challenge, and as soon as all 3 heroes step on the battlefield, press Assault and go AFK. They can handle it, albeit slowly as the Dragon gets easily distracted in the Goblin rain. Keep upgrading those troops and doing it again and again. When I did this on Epic with lvl 2 Sky Dragon, Maxed Kara, Popo and troops and I ended up with 94k kills and 1.2 million gold, and all I had to do is press "assult" when it started - guild was at level 1. But it is an "epic" long tug of war that you eventually win. " -RagingAngel
this set up can win any level at any difficulty, as long as the units and heroes are upgraded a sufficient amount, and if you dont have the money for the skydragon, you can exchange the epic tank for the dragon and still win just about any of the levels below 12, maybe even higher
 "Castlewars"){kind=icon}
 "Innkeeper"){kind=icon}
 "Electric Box 2"){kind=icon}
 "Epic War 4"){kind=icon}