Core loop
Click Harvest Brains and recruit Undead Generators for passive brains/sec. Each generator tier boosts the others.
Rebirth & Talent Tree
Rebirth resets your run for Mutations and Rebirth Points. Spend points in the Talent Tree — glowing nodes are affordable, greyed ones need more points.
Mutagen & Bio-Refinery
The Mutagenesis talent unlocks Bio-Refineries that convert brains into Mutagen. After that, rebirth requires Mutagen instead of brains.
Golden Brain & Events
- ⚡ Frenzy
- ×7 brain production for 30s
- 🌧️ Brain Rain
- ×15 per manual click for 20s
- 🌑 Blood Moon
- ×3 production for 60s
- ☣️ Toxic Fog
- ×2 to everything for 45s
- 🩸 Feeding Frenzy
- ×5 click power for 30s
The Golden Brain roams the screen every so often — click it for a random buff or a brain windfall. Outbreak Events trigger the buffs above automatically with a banner.
Achievements & Specimen Lab
Achievements grant permanent bonuses at milestones. The Specimen Lab lets you capture collectible zombie specimens — duplicates level up and stack production multipliers.
Automation (deep talents)
Auto-Buy recruits the cheapest affordable buildings for you; Auto-Rebirth rebirths the moment you're eligible.