You and a group of friends are trapped in a cave, which will soon fill with water from the incoming tide. You have minutes to live and there is only one small hole where you can escape.

Chunky, over-sized ‘Big Jack’, decided he was going to be the leader and get the group to safety. But he is now lodged in the hole and can’t budge. Because he is stuck, no one else can escape. When the water seeps in, he will survive because his head is out, but everyone else is doomed.

You have a single stick of dynamite, which will blow up a human being but not open another entrance.