Last Verified: September 2026 | Three codes, all three working, and nothing on the expired list.
If you came here for the current Build a base RNG codes, there are three of them and all three still work. Two of them pay Hero Coins, 1,500 between them. The third one pays a jackpot spin instead of coins.
The better news is what is missing. This game has been open for a hundred days and has never switched a code off, so the expired table further down this page has nothing in it. Nothing here is going to run out while you are reading.
Active Build a base RNG Codes
All three work right now. They are sorted by the coin figure, so the biggest flat payout sits at the top.
| Code |
Reward |
Action |
| HEROUPDATE |
1,000 Hero Coins |
|
| 404PROBLEMS |
500 Hero Coins and a Coin Boost potion |
|
| JACKPOT |
One Jackpot Spin |
|
Codes here are case-sensitive. Type them exactly as they appear, in capitals, with no spaces on either end.
Do all three in one sitting
There are only three, none of them expire, and there is no wait between one and the next. Two minutes and you are done with the lot.
Which of the Two Coin Codes Is Actually Bigger
HEROUPDATE hands you a flat 1,000 Hero Coins. 404PROBLEMS hands you 500 and a Coin Boost potion on top.
So one gives you twice the coins up front, and the other gives you half of that plus something that earns while you play.
The game does not say how strong the boost is or how long it lasts. That means there is no honest way to put the two side by side on paper and call a winner.
Here is the rule of thumb. If you are about to log off, the flat 1,000 is the safe one. If you have just sat down for a long session, the boost has time to pay for itself.
You get both either way, so the only real question is which one you type first.
Expired Build a base RNG Codes
There is nothing to put here, and that is unusual enough to be worth a line of its own.
The expired list is empty
Not one code has been switched off since the game opened. Every code it has ever handed out is still in the table above.
Most games this age have a dead list longer than the live one. Codes go out with an update, run for a week or two, and get switched off when the next batch lands.
That has not happened here yet. All three codes are still being taken, including the oldest one.
It does not make them permanent. The studio can switch any of them off whenever it likes, and it does not have to say so. It just means there is no rush on this particular page.
How to Redeem Build a base RNG Codes
1Open Build a base RNG and wait until your grass and your base have loaded in.
2Press the Shop button. It sits down the left-hand side of your screen.
3Scroll the Shop window all the way to the bottom. The code box is the last thing in it.
4Use the Copy button in the table above, then paste it into the Insert Code box.
5Press the green Submit button. The coins land straight away.
6Do the next one. There is no wait between them.
Each code works once per account. If one gets refused, check for a stray space at the end before you decide it is dead.
The code box being at the bottom of the shop is the part people miss. It is not on the main screen with the other buttons.
One Code Is Named After an Older Update and Still Pays
HEROUPDATE is named after the heroes side of this game, and it pays Hero Coins to match.
The game has moved on since. Its title now leads with a worlds tag, and the description on its own page is about a new lava world with different weapons and different enemies.
The code kept working through that change. It was made for one update and it is still being taken during the next one.
An old-sounding name is not a dead code
Plenty of people skip a code because it is named after something the game has already been through. Type it anyway. It costs you five seconds to find out.
What All Three Are Worth Together
Here is the whole lot in one place, if you sit down and do them in one go.
| What you end up with |
How much |
| Hero Coins from the two coin codes |
1,500 |
| Codes that pay coins |
2 |
| Codes that pay a spin |
1 |
| Biggest single code |
1,000 Hero Coins |
| Codes retired so far |
None |
The spin is the odd one out. It is the only reward on the page you cannot put a number on, because what comes out of it is down to the roll.
When Do New Build a base RNG Codes Drop?
The studio does not publish a schedule, and we are not going to make one up for you.
What the three names do show is where they have come from so far. Two of them are tied to updates, and the game has had several since it opened.
It was last updated three days before this page was checked, so it is still being worked on regularly.
We recheck this page and change both sections the moment anything moves.
About Build a base RNG
Build a base RNG is a tower defense game by the group Slungpy Games, which does carry a Roblox verified badge and has 1.8 million members. You roll a dice for a weapon, plant it on your grass, and hold off a line of enemies.
Every wave is bigger than the last, so the catapult that carried you through wave one is not going to hold wave thirty. That is where the coins go.
It opened at the end of May 2026 and has passed 60 million visits. A server holds six people, and the game’s own page says your base keeps fighting after you log off.
All three codes on this page were checked in September 2026. Codes are handed out by the game’s own studio and can be switched off at any time without notice, so a code that works today may not tomorrow.