GameZebo: We already know the quickest way to take out a zombie is by taking off its head. That's common knowledge. But did you know trains are also great for accomplishing mass zombie genocide? Dragonhead Games is on board, barreling through the App Store with a unique take on the usual zombie apocalypse simulator: Zombies and Trains. It's an addictive, fast-paced exercise in tower defense where the shuffling undead horde is out for the brain in the center of the play field, and it's your job to ensure they go hungry or are obliterated. Brutal? Yes. Fun? Absolutely.