But if the island is abandoned, why has someone built a fort? You won't like the answer: zombies! Luckily, the walking dead make excellent target practice—and you're an experienced fighter. You know what to do: time for some action-packed undead tower defense! Shoot zombies as they emerge from the jungle mists, killing them before they can breach your defenses. Use the bucks you earn to upgrade your weapons. Unlock achievements for even more cash.