Beat the Devil
In Robert Camisa's Beat The Devil, Lucifer is building an addition to Hell, and you're his betatester. He overheard you mumbling about how you'd sell your soul for a chance with the object of your affections, and, being surfeited with souls already ("Washington and Hollywood provide me with all the souls I'll ever need to buy."), makes you this alternate offer: wander through this Stygian mall and defeat the incarnations of the seven deadly sins, and that date is yours. It's a fun concept, and Beat The Devil gives it an energetic, cartoonish implementation.