Travelling through mountains demands a lot of stamina. Every character has his own strengths and weaknesses. You'll discover this after intensive playing. Luxor, for example, wears a Moon Ring, which protects him against the Frost Spell. You can easily change to other members of your group by pressing some keys.
All action is done via the keyboard.
You can find a summary of the keys here . The game came in a big cardboard box with a booklet introducing you to the world of Midnight and at the back side there was a map with an overview of the world. I put some tape on it so I could write down my movements and targets. You need to do this because this is a big world with lots of character movements. Luckily you could save it to tape to get some sleep.