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Outbreak Checkpoint is a survival defense game where your inventory shapes your firepower. Build an arsenal inside a limited grid, combine weapons and attachments, and hold your checkpoint against growing waves of enemies.

Every reward brings a choice: take a new weapon, upgrade your favorite, or make room for an attachment that changes your build. How much firepower can you fit?

BUILD YOUR ARSENAL

Arrange weapons and equipment inside your loadout grid. Rotate items to fit their different shapes, manage temporary inventory, and expand your available slots as you survive more waves.

MERGE. UPGRADE. UNLEASH.

Merge two identical weapons of the same level to create a stronger version. Upgrade weapons through four levels, from your starting pistol to an arsenal capable of holding back the horde.

Choose from 10 weapons, including the minigun and bazooka. Experiment with 20 attachment types and 88 compatible individual weapon–attachment pairings to find combinations that suit your strategy.

COMBINE THE ELEMENTS

Bring fire, cryo, electric, and toxic effects into combat. Combine elements to trigger six reactions: Thermal Shock, Toxic Combustion, Plasma Overload, Blight Frost, Static Shatter, and Volatile Toxin.

Build around the effects you enjoy, then watch your choices come together on the battlefield.

HOLD THE LINE

Face increasingly crowded waves, earn rewards, and adapt your loadout as the pressure grows. Use automatic attacks or aim manually, and adjust the game speed to suit your pace.

Between runs, spend earned coins on permanent skill-tree upgrades to strengthen your next attempt.

Features

• Inventory-based arsenal building with shaped items and rotation.

• 10 weapons that merge up to Level 4.

• 20 attachment types with 88 compatible weapon–attachment pairings.

• Four elements and six elemental reactions.

• Expanding inventory space as waves progress.

• Automatic attacks and manual aiming.

• Adjustable game speed.

• Permanent upgrades through a coin-funded skill tree.

Build your arsenal. Hold the line.