Tips for writing a one-off?

[Totally Guy]

You need to have a conflict that can be played out in a single sitting.

Are you one shotting AFMBE? What kinds of situations does that game do? I'd stick to the core strengths of the system that you are running.

You have the option to break some conventions such as putting the characters in conflict with one another or the very real possibility of the everybody dies ending. Those may or may not be valid options depending on the system.

Player characters can be pregenerated, created as a group or brought to the table. This too depends on what you're going for. A dungeon crawl might be about bringing a guy to the table to see if they make it. I've done group character creation for light systems like Inspectres. Pregenerated characters work great for internal drama if you make characters with incompatible goals.

Personally the best game I've ever played was a oner shot with pregenerated characters and incompatible goals.