Loken
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it’s definitely possible. Academy – you only deploy gargoyles and shoot with magic.
Dungeon – the same, but with invisible units. Plus, there are no losses, or almost none.
Haven – you can split archers into several stacks, or you can only use royal griffins if you managed to build them quickly. But for some reason, I’ve never encountered any particular problems with Haven archers; I can’t say why.
Inferno – only demons. Portals plus a hero. They will die, but that’s okay, right? If you manage to build horses, they will also dominate everyone.
And so on.