I'm thinking of putting together a quick guide for solo play... did you have any problems with a particular level?

I think as a solo player the wider wave levels and the escort levels can be challenging; I have a few tips for: Snowfly Peak, Vaaran Safehouse, Cracked Catacombs, Clarent's Sanctum, Hozai's Vault

It's a bit surprising how little there is about this game.