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Games Like S.A.C.K. - Survive and Choose Knowledge

Release date TBA·Christian Schilling·
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You are a backpack fighting alien swarms on an expanding moon base. Build your loadout from unique weapons and towers, deploy turrets within your build limit, choose boss evolutions, and get permanently stronger. Bullet Heaven meets Tower Defense!

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About S.A.C.K. - Survive and Choose Knowledge

You are the backpack. The galaxy is your problem.

S.A.C.K. drops you as a living backpack onto an abstract moon surface, surrounded by relentless alien monsters. Your only goal: survive, adapt, deploy your defenses, and come back stronger.

Bullet Heaven Meets Tower Defense

Battle through massive swarms with a fully customizable arsenal of up to 6 unique weapons and towers in your inventory.

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Your Tower Limit: You have a max limit for active towers on the map. Upgrade this limit as you level up!
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Total Deployment Freedom: Use your unlocked towers however you want within your limit. Have 3 different tower types in your inventory? You can place 4 Fire Towers and 2 Baseball Towers, spam 7 Standard Towers, or ignore towers entirely and rely purely on mobile firepower.

Your Base Grows with You

Every 5 levels, you choose a direction to expand the map. Expanding gives you more space to place towers and dodge enemies, but beware: every expansion introduces new obstacles and portals that send fresh alien waves your way.

5 Bosses + 1 High-Score Boss

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Boss Evolutions: Defeat up to 5 unique bosses per run. Every victory rewards you with a choice of powerful evolutions for your weapons and towers, while introducing tougher enemy types to the map.
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The Final High-Score Boss: Survived all 5 bosses? Prepare for the ultimate test. The final boss is an unbeatable menace designed solely to challenge your complete build and push your high score to the absolute limit!

Upgrade Cards & Permanent Progression

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In-Run Upgrades & Rarity Tiers: Level up to draft randomized upgrade cards (featuring common to legendary rarity tiers) to raise your tower placement limit, boost stats, or empower your arsenal.
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Meta-Progression: Collect gold dropped by aliens to buy permanent stat upgrades between runs—increase your damage, range, build limits, and survivability.

Key Features

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Custom Loadouts: Up to 6 unique weapons and towers in your inventory to mix and match.
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Flexible Tower Deployment: Place your unlocked towers freely on the map up to your current tower limit.
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Expandable Map Grid: Expand your map every 5 levels for more placement space—and new enemy portals.
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Boss Evolutions: Defeat 5 bosses to claim run-changing weapon and tower evolutions.
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Endless High-Score Boss: Challenge an unbeatable final boss to show off your ultimate build.
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Card Drafting & Rarity System: Pick in-run upgrades with distinct rarity tiers.
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Permanent Meta-Progression: Use earned gold between runs for permanent stat boosts.
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Charming Visual Style: A stylized mix of pixel-art effects and clean vector graphics in a family-friendly alien setting.

Steam data © 2026 Valve Corporation. Trademarks are property of their respective owners.

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