(This idea is shamelessly stolen from another forum I frequent. I thought it would be fun to bring it here too.)
The premise
30 colonists (15 of each gender) are travelling in cryostasis aboard a colony vessel. There is a malfunction in the ship, and it jettisons the colonists in a shuttle towards a nearby Earth-like planet before exploding spectacularly. The shuttle lands in the ocean, and though the colonists are able to make it to shore, it sinks irretrievably.
Now here's the kicker - while these colonists are physically adults, they are actually clones (though of 30 different people) brought to maturity in a matter of months. While they were being programmed by the ship, the premature ejection means that they only have a basic elementary school education. Because of their hasty retreat, all they have are the obligatory sci-fi jumpsuits (which were intended to be disposable and won't last long) - no tools, no food. In order to survive, they must build a life out of nothing, which is where you come in.
The game
Your role is to teach these colonists inventions and methods that they will need to survive and maybe even thrive: how to make weapons, forage for food, make fire, and so on. When dilemmas arise, it will be up to you to use existing technology and resources to solve them.
The rules
1) Anyone may join and may discuss with relevance to the game.
2a) You may only post a single invention and may not post another before 2 other players have.
2b) Linking to a Wikipedia article does not constitute an invention. You must phrase them yourselves.
2c) Inventions must include instructions and may not assume to use things that aren't decidedly available (i.e. you can't sharpen a wooden stick without cutting tools or methods).
3) You may not assume success or failure on any invention or directive. You are only to instruct. I review what is instructed and provide according reaction.
4) You may assume that raw materials of almost any kind sensible for the climate/season/etc are available. If the materials you need wouldn't normally be available, your invention is on hold until you find the resource.
Status report 1
Season: It is the beginning of autumn.
Location: We are camped out on the shore. The ocean next to us stretches on indefinitely. There is fresh water, and a large forest that also stretches as far as we can see.
Problems: We are cold. We are hungry. We have jumpsuits but they won't last long.
Technology: None
Current events: None

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(I'm just full of them.)

Do they even know how to organize themselves ?