I'm asking for some help.
You see, I'm writing this game. It will be a Adventure Game (much like Monkey Island); being an adventure game, the story is the essential element.
The setting is of 6 friends who are completely and utterly alone. We don't know how or why, but for some reason they are the last people on Earth.
Now, that's all well and good but here's the problem: I can't make an Adventure Game out of that. An Adventure Game must have a plot defining problem that the player must solve, in fact, this is true for any story medium. There is always a problem in every book and film you've ever seen or read, and the characters solve it.
What I'm looking for is ideas as to what could happen to 6 people who are stranded on This Island Earth completely on their own.
The rules are:
The characters can't come into contact with any other "groups" (the story's main twist relies on them not meeting anyone else)
No horror clichés or creatures
No aliens
No obvious rip offs