Hi! On your turn each round, you have to place all your pieces (dice and coins) on the map. Since no room has more than four squares, you’ll need to place some of them outside the “active” room (the one where the adventurers are). This way the adventurers can hit you.
At the end of the round, after the adventurers’ turn, you take back all your pieces. At the start of your next turn, you roll/flip them again and place them on the map again.
I am planning to write a small one round example because the rules may be a bit complicate to understand.