Anton now that you released the video showing off the arcade mode

[haitch40]

Originally Posted by Anton Yudintsev

You have to unlock Arcarde/Realistic/Sim mode by finishing special tutorial missions (rather short). Arcade tutorial is required, others are optional.
That is done, to prevent casual player from unintendently selecting of realistic/simulation mode.

After that, you will be able to play Campaign in mode of your choise.

quick question
whats the difference between sim mode and realistic mode?