Zombie Games
Zombie games turn the undead into the enemy or the theme. The settings vary, from tower defense to sniping to a puzzle where a monster eats the zombies, but the idea stays the same: hold on against something that never stops coming.
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What counts as a zombie game here
Zombies must be the enemies or the theme. Empire Tower Defense - Zombie Fortress has you place archers to protect a fortress, Pinball vs Zombie mixes pinball with plant defenses, Plant Merge: Zombie War merges plants to stop the horde, and Zombie Sniper casts you as a survivor who fights the undead. Doomsday Hero is a shooter set after an outbreak, and Monster vs Zombie is a sliding puzzle.
How to pick one
Pick by style. Defense games suit planners who enjoy placing and upgrading units. Sniper and shooter games suit steady aim and quick reactions. Puzzle versions are calmer and better when you want to think. Whatever you choose, use the early waves to learn how enemies move, since later waves usually build on the same patterns.