I believe that Inferno Towers multi target mode should be unlocked at level three (maybe two). IT's are huge game changers in CoC so many people just rush THs to get them so that a premmy Th10 with IT's is pretty much the same as a maxed Th9. I know it wouldn't change much because then they'd just focus their upgrades on the IT's immediately but I thought it would be worth a shot.
