Most iron and fist challenges are impossible. The final fist is impossible due to extremely tough skeleton swarms without any artillery, meaning million losses of innocent citizenship. Also, this game took away several stages and put them on a paywall. Absolute shittery if you ask me.
With so many hints at my disposal, I'd really love to use up all of my hints, rather than selling them. Due to the extreme loads of recuits, it would take hours to just unlock each unit individually, so I want to use all my hints with the press of a single button.
Critical hit number will be back in next update.