Upgrades are the only meaningful capital sinks in Merge a Nuke. Players must choose between linear (Max Spawn) and exponential (Spawn Tier) investments, and the optimization is non-trivial.
Raises the baseline tier of newly spawned nukes. Reaches at least Level 36 in normal play, with documented late-game spikes to Level 38. Acts as the primary time-compression upgrade.
Maximum simultaneous on-board nukes. Scales to Level 26 mid-game and Level 36 post-rebirth. Hard cap at Level 50.
Interval between free nuke spawns. Halved by the x2 Spawn Speed gamepass.
Keep entries useful by separating source-backed facts, player-tested strategy, and update timing.
Keep rarity, obtain method, abilities, and summary tied to official posts or repeatable in-game testing.
Link upgrades entries to matching builds, boss routes, and guide sections.
Keep tier values and obtain methods current after each game update.