A mature campaign for Sony's PlayStation? Sounds like an oxymoron. But how else do you expand the audience for the PlayStation 3? Reduced to $299 and being positioned more as a media center than a mere gaming console, the PS3's challenge is to appeal to moms, dads and even grandparents (gulp!) without wussing out and alienating hard-core gamers who undoubtedly would flame PlayStation into the next millennium if it came out with hokey ads.