Merge a Nuke Progression Guide
Know what to focus on at each stage so your base keeps growing without wasted upgrades.
Quick answer
Codes → Spawn Speed → Spawn Tier → merge toward 16+ → lock base → raid only when stable. Rebirth unlocks higher Index tiers.
Progression Roadmap
Follow this path from your first bombs to rebirth. Each stage builds on the last, so don't skip ahead before your base is ready.
Swipe sideways to see all stages →
Stage 3 (Income Upgrades) maps to the in-game Store — see the full Store upgrades guide for Spawn Tier, Spawn Speed, and Lock Base priorities.
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