To WIN, each Prisoner must first collect a Key. That accomplished, the group must find and make their way to a single Gate. Only when assembled there, together, can the Gate be unlocked by turning the Keys in unison, escaping The Night Cage.
The Prisoners LOSE if:
• All 4 Gate Tiles have been lost.
• The Prisoners cannot each collect a Key.
• The Prisoners cannot all bring their Keys to a Gate before the darkness isolates them.