How does Zaroff stock his island with 'game' and what are the rules of the hunt?

Zaroff reveals that he has set up a trap on the island. There are lights that indicate a channel but there is actually none. Many ships end up wrecking on the rocks near the island. Zaroff collects the men, feeds them, and sends them to his training school for preparation. He then releases them one by one into the jungle under the guise of joining him on a hunt. Zaroff gives the men a head start and then pursues them during the cover of night. The rules of Zaroff’s game are simple—if the prey is able to elude Zaroff for three days, then he has won.