Silver Moon
Adventurer
I recall a three-round RPGA extravaganza that set up mulitiple scenarios but didn't require them to be played in a particular order. The charcters were all pirates on a pirate ship with a female captain. The characters were all well written, with many individual motivations and varying interactions to the other charcters, which leant heavily to role-playing. So it was a character-driven rather than plot-driven game.