How does the 6 action work, and can I use it on an action space with no dice?

Question

Accepted Answer

Pay 1 krone, pick any of actions 1 to 5, and carry it out using the count of dice sitting on the 6 space as its strength, not the count of the chosen action. It does not matter whether the chosen space has dice left. One 6 die gives one action; you cannot split it into several. Adding the 1-krone boost makes it stronger, and you need the krone to take a 6 at all.

Grand Austria Hotel

How does the 6 action work, and can I use it on an action space with no dice?