Zombie Parade Defense 4 continues with new defense. Defense this time is more difficult because zombies now attack from both directions. But there are new stronger weapons, bonuses and the 4th player joining the game. You must stop the zombies coming in waves before your castle falls. Zombie Parade Defense 4, tower defense, zombie game, 2 player, cooperative, castle defense, strategy game, action game, 2D game, upgrade, weapons, bonus, war, undead, mobile game, puzzle, survival, battle, shooting