Undead Backpack: Merge Defense

The dead are marching. All that stands between them and your castle is one hero — and one very full backpack.

Undead Backpack Defense is a merge + tower-defense roguelike you can play in short bursts. Buy weapons, arrange them in a 5×5 backpack and merge identical gear into ever stronger relics. Then press Start Wave and watch your build tear through the horde.

⚔️ MERGE YOUR WAY TO MYTHIC
Throwing Knife → Hunter Bow → Sniper Rifle → Gatling Gun → Railgun Destroyer. Five weapon lines, five tiers each — then merge two Mythics to EVOLVE them into a sixth form with its own power, and keep merging for unlimited stars.

🧩 POSITIONING MATTERS
War Totems buff the weapons next to them. Golden Shrine corners make weapons attack 35% faster. Every square of your backpack is a decision.

🔧 FUSE HYBRID WEAPONS
Hold one weapon over a different one to fuse a mechanical hybrid with a brand-new attack: Ricochet Saw, Harpoon Winch, Cluster Mortar, Gravity Anchor, Caltrop Launcher, Battering Bolt, Net Launcher and Pendulum Blade. Hybrids hit bosses extra hard, and blueprint shards from bosses and chests rank them up.

🛠️ MUTATE YOUR MERCENARIES
Fit a part onto a mercenary contract to mutate it: Shield Wall Bash, Ballista, Lance Charge, Siege Engineer and Bell Tower.

🎯 A LIVING BATTLEFIELD
Choose lob, standard or flat fire for each backpack column, build on machine cells, pick a formation, then shove zombies into pits and spikes.

🔥 FIVE ELEMENTS, ENDLESS SYNERGY
• Physical: rapid shots and deadly crits on bosses
• Fire: splash damage that leaves the horde burning
• Frost: slow, freeze and stun
• Poison: stacking toxins that melt armor and raise skeleton guards
• Totem: auras that multiply everything around them

🃏 ROGUELIKE BLESSINGS
Pick 1 of 3 perks as you fight: Ricochet Bullets, Vampiric Merge, Golden Interest, Totem Resonance and more. No two runs play the same.

🗺️ AN ENDLESS CAMPAIGN
Chapter after chapter of randomly generated stages: defend the wall, survive elite packs, take on cursed stages and choose your fate at the crossroads. Your progress saves after every wave.

🏰 GO ON THE OFFENSIVE
Storm the tombs before time runs out, raid the boss lair at the end of every chapter and unleash your hero's ultimate: Holy Judgment, Glacial Age or the Watcher's Charge.

⚔️ HIRE MERCENARIES
You are not alone on the wall. Put mercenary contracts in your backpack to field Shield Guards, Archers, Priests, Knights and Battle Mages, merge contracts to promote them and train them in the Barracks.

💀 EPIC BOSSES
The Grave Golem, Blood Knight, Plague Dragon and the Lich King fight in three phases, with brand-new skills, summons and a cinematic entrance.

🌳 PERMANENT PROGRESSION
Earn gems every wave and invest them in the Talent Tree: more damage, more silver, stronger walls.

😈 NORMAL → NIGHTMARE → HELL → TORMENT
Difficulty never stops climbing. Champions spawn with affixes such as Shielded, Splitter and Frostbind, and the loot gets better with every tier.

💎 LEGENDARY RELICS
Legendary amulets, rings and banners whose effects change the rules of the fight.

📜 A DARK STORY
The Eternal Night has fallen and Dawnhold is the last city standing. You are its Watcher, carrying the relics of fallen heroes.

✨ MADE FOR MOBILE
• Portrait, one-handed play with drag & drop or tap-to-merge
• Play offline — no account required
• 1x / 2x / 3x battle speed
• English, 简体中文, 繁體中文, 日本語, 한국어

Free to play. Optional rewarded videos give bonuses — you never have to watch one. A one-time No-Ads VIP Card turns every video reward into an instant free claim.