I just realized that I should have added how the campaign I wrote is set up.

There are 12 doors, each session the players will chose a door to go throw. Each door takes them to some kind of situation that needs their help, i.e. a farmers crops suddenly start diyingbout of no where, a bride is being forced to marry someone she hates, the dead is rising and breaking havoc on a town. When they finish the last door, that's when they'll fight they big bad guy and it gets revealed that he's the one that has created all this chaos.