The most challenging campaign.

1. It's all straightforward, except for the upper garrison in the fifth mission, which is challenging but not mandatory. 2. It's all straightforward. Quickly complete missions 1-2, rush with vehicles in missions 3-4, and use magic in mission 5. 3. It's all straightforward. Get the phoenix in the second mission, and you can forget about the difficulty. 4. The Cultist mission is challenging. Evil heroes of level 22 gradually destroy the Minotaurs, so you need to think strategically. The other missions are very easy. 5. The entire campaign is easy; you can take your time with the fifth mission. Problems only arise for those who don't upgrade the Chaos Machine and Logistics early enough. 6. The difficulty lies only in the second mission, and only if you don't have the phoenix from the first mission. Also, it can be tricky not to get confused with the upgrades in the fourth mission.