Operation: Outbreak Idle (2026)

Command automated military defenses, upgrade your fortress, and survive massive zombie waves in this action-packed idle defense game. Build powerful defenses, unlock upgrades, and hold the line against endless undead hordes.

• 24 Steam reviews
• 79% positive
• released 2026

Tags

• Tower Defense
• Zombies
• Bullet Heaven
• Bullet Hell
• Strategy
• Singleplayer
• Casual
• Survival
• Shoot 'Em Up
• Incremental
• Shooter
• 3D
• Indie
• Top-Down
• Stylized
• Military
• Colorful
• Combat
• Idler
• Top-Down Shooter

See Operation: Outbreak Idle on the map of Steam · Steam store page