Me and my friends plot draft

[Hope]

We're making a table-top RP called Pandora's Box. This is out basic plot idea.

The basic plot is there a was war on this planet Galatica  and one side created the ultimate weapon, called Pandora’s Box, but when they used it the whole universe fell out of balance, and the weapon ended up in a different dimension. Now to people from that planet have gone to get it, while another warrior from that planet's child form has also ended up there, due to what the weapon did. Meanwhile, a girl called Hope has come from hell to that dimension, to retrieve some weapons of hell that were sucked into that dimension when the weapon was activated.

[Ron Edwards]

That's a plot for a story. It's not a role-playing game, however. At most, it would be part of the game's setting.

What makes a game work best, though, is not just a colorful setting. It's what the people do in order to have cool stuff happen. If the colorful setting gives the people a way to make the cool stuff happen, then the setting is wonderful ... if the colorful setting does nothing, or only does familiar stuff that other settings do (e.g. provide "races" for characters), then the setting is actually a waste of time.

So in your game, what do the real people do in order to have cool stuff happen? Better yet, what game-experiences have you had that you enjoyed so much, that you'd like to see the same stuff happen when people play your game? Or which have been so sucky that you want to make sure that your game won't catch people in the same traps?

Best, Ron