ADA and PopCap Games are giving away free copies of Plants Vs Zombies game for PC / Mac this Halloween. As per the site stopzombiemouth.com : “This Halloween, the ADA and PopCap Games are redefining what a Halloween “treat” can be… by giving FUN instead of candy. We’re giving away Plants vs. Zombiesâ„¢ download games as a sugar-free alternative, and you can join...