Take the challenge of surviving this deserted island. What you see in the screenshot is all you get. Everything else is water.
The rules are simple, survive on the island, with what you find on it and below it. You can technically keep swimming, but there is a bedrock wall that goes from the bottom layer to the top, so you can't leave.
Update: Added some wheat to the map to make things a little easier. And I added to the outer walls, so it should be impossible to leave the area now.
You work in an underwater lab. You are a diver, and when you get back aboard your submarine, you find that your crew are missing and your submarine has malfunctioned. Where have they gone? You must survive on a stranded and lonely island until help arrives, or if help arrives. Can you survive with limited resources and food?