MQ: Potion of Monster Control - Few questions

[vitalexbel]

Game: Munchkin Quest
Card: Potion of Monster Control

I have a few questions about the effect of this card.

1. Direction is:
a) up/right/down/left (in other words north/east/south/west)
or
b) colored arrows ?

2. If 1 monster goes through 2 rooms, does it have to do so in one direction (e.g. left) or can it move in a zigzag (e.g. first left, then up) ?

3. If I move all monsters of the same color, must they all move in the same direction, or can I choose a different direction for each (e.g. one goes up, the others down)?

Thank you in advance for the clarification.