(1 day = 3 days)
The first day was finished, only nine left.
You wake up the next morning to find three doors opened and unlocked.
"Looks like you survived the first day," The Voice said, "but can you handle nine more?"
Two of the doors had the number three over it and the one in the center had a number two over it.
You couldn't see what was on the other side of each door, but it probably was another puzzle.