Inferno tactics.

Hmm... I believe you, of course, why would I doubt it... However, recruiting 66 demons... So, on the first day, you must have built a Pit with a castle (Ifrits?).

Day one - Demon Gate
Day two - Guild of Mages
Day three - Hell Pit
Day four - Guild of Mages level 2
Day five - Hell Pit upgrade
Day six - Efreet
Day seven - Dogs
Starting on the Queen. At the start, I got Ogres. The second hero had 35 Pikemen. On day 5, I took Pit Lords with the second hero and went for it. There was a hidden stash of Imps and Dogs. There were 3 Pit Lords. I bought more on the second week. I recruited Demons from Imps, Ogres, Dogs, and Pikemen + my own from the castle.

Then, as I understand it, you took Utopia with 8 Green Dragons, 6 Red, 4 Gold, 3 Black... Hmm... You probably got some Ottomans somewhere else, but you also needed something for recruiting demons... Although, you can probably do it in offline mode...
Anyway, that's awesome!!!

No. Utopia: 7 Green, 5 Red, 2 Gold, 1 Black. Demons under the Shield spell - the main force. The rest is cannon fodder. After the battle, a few demons remained. My goal was simply to take Utopia. Then I just quit the game