Nuke a City Secrets and Hidden Features

Nuke a City has no official secrets list. Nuclear Fun does not publish a changelog and the Discord announcements are sparse. But thousands of players spending hundreds of hours on the same shared city eventually find things that are not in the tutorial. This page collects what has been confirmed by multiple community reports: behaviors, unlockable milestones, and server quirks that are real even if they are not announced. Nothing here is invented. If something on this page is wrong, the fix is in the comments.

Offline fill and the exact idle mechanics

The official Roblox listing says explosives grow offline. Players have confirmed this works: log out with a partially filled bar and return hours later to a full explosive or several. The community has spent time testing the exact boundaries.

Confirmed offline behavior:

• Droppers of all types (manual, fountain, nuclear, poison) continue filling explosives while logged out.
• The rocket does not fire offline. Launching still needs a live session.
• Fuse does not advance offline. The wait timer stops when the client closes.
• Codes do not redeem offline. The ABX menu needs a live connection.
• Rebirth cannot be triggered offline. The statue requires an active session.

The ceiling on offline fill has been tested. Returning after 24 hours shows explosives still growing, but the exact cap (if any) is disputed in community threads. Some players report a soft ceiling where fill speed drops after a certain point; others report uninterrupted growth. Until Nuclear Fun confirms a cap, treat offline fill as the most reliable idle system in the game, and understand it solves the fill problem without solving the launch, fuse, or rebirth problems.

3 NEW CODES & HOW TO PLAY! | Nuke a City! ROBLOX

Server migration and base preservation

When a server instance closes or migrates, what happens to your base? Community reports consistently show:

• Machines and their upgrade levels persist across server migrations.
• Cash on hand at the moment of migration is preserved.
• The rocket queue (loaded explosives not yet fired) does not persist; the client must be live to load and fire.
• Research Points and purchased research upgrades are account-bound and survive any migration.
• Placed totems survive. Timed crate boosts do not.

This means a mid-session server kick is inconvenient but not catastrophic. The nuclear dropper and its upgrades survive. The cash survives. The only real loss is a queued explosive that was loaded but not fired.

The shared city rebuild mechanic

The city in the middle of the six-player server is shared and dynamic. When a launch hits, blocks disappear. Community observation over thousands of hours has produced a rough model:

• Blocks regenerate slowly between shots. A cratered downtown area will have new structures within a few minutes of the last impact.
• Regeneration speed appears consistent across servers, suggesting it is a server-wide timer rather than a per-player trigger.
• A full city wipe (all blocks flattened) is possible with a large-enough explosive, but the city rebuilds rather than staying empty.
• Multiple players firing in rapid succession can overlap blast zones, producing larger combined craters in some reports.

This matters for steering. An explosive that lands in an area that was already flattened pays less than one that hits a freshly regenerated zone. Advanced players learn to read the city state: fire into rebuilt areas, queue launches for post-rebuild windows, and avoid firing into their own previous craters.

Research Point payout variance

Public reports cite approximately five Research Points per rebirth. This is a community average, not a confirmed developer number. Community threads have surfaced cases where:

• Short runs (under 10 minutes, few launches) still paid RP, suggesting a minimum floor.
• Very long runs (over two hours of active launching) did not pay proportionally more RP, suggesting a soft ceiling.
• RP appears to scale with total cash earned in the run, not with time spent.

Until Nuclear Fun confirms the exact formula, treat five RP per rebirth as the planning number. A player who earns 500,000 cash in a run and a player who earns 5 million both rebirth, but the 5-million run may pay more RP in some interpretations of the community data.

The free group totem and how to claim it

The free group totem (reported as 3x or 4.5x money multiplier) is one of the most valuable items in the game and costs zero Robux. Community guides confirm:

• Join the Nuclear Fun group on Roblox.
• The totem appears in the in-game shop or inventory, not as a code.
• It does not require favoriting or liking the experience.
• It is permanent and persists across rebirths.

Players who missed this on their first run report finding it in the shop months later after a guild member mentioned it in passing. New plots should claim it before spending any cash on machine upgrades.

Plot expand beyond the first

The first plot expand unlocks nuclear, poison, and the rebirth statue. Community observation suggests:

• Additional plot expand purchases are possible and add more land.
• Each additional expand appears to follow the same unlock pattern: new land, same shop items available.
• The nuclear dropper remains the priority purchase on any expanded land.
• Late-game plots with multiple expands can hold several nuclear droppers.

This is relevant for players past the first rebirth who are optimizing a large-scale factory. Multiple nuclear droppers on multiple expanded plots can produce explosive queues that outpace a single rocket cycle.

What is probably not a secret

Community threads regularly surface claims that do not survive cross-checking:

• No confirmed secret code beyond BOOM as of September 2026.
• No confirmed in-game badge that unlocks machines.
• No confirmed second rebirth statue.
• No confirmed way to disable the shared city (private servers remain disabled per Nuclear Fun).

Treat unconfirmed community discoveries with skepticism. If it is not on this page, it may not exist. Check the Codes Hub and the Updates Hub before building a strategy around a Discord rumor.