How to Redeem Codes in Defend Bunker from Zombies
Enter promo codes in the Shop codes box and claim Shards or potions in seconds.
Redeeming codes in Defend Bunker from Zombies — also known as Survive the Zombies (STZ) by the same Bunker Corp! community — takes less than a minute once you know where the input lives. Promo rewards stay inside the game UI, separate from your run inventory of wood, food, and fuel. Whether you are claiming UPDATE_01 for 100 Shards or FREEPOTIONS for Shard boost potions, the process is identical — only the reward type changes. Both codes were still working on the live build in August 2026 when entered exactly.
Start on our Codes Hub for the current working list, then return here if anything fails. For finding the next promo after these expire, read How to Get More Codes. For what rewards buy, read Shard Rewards Explained.
Before you redeem
Make sure you are playing the live published experience, not a stale test place. The official game ID is 134361906638337 on Roblox. Launch from the experience page or a direct invite so your account syncs with the latest build — outdated clients sometimes show Shop UI that rejects new codes.
You need a Roblox account logged in on the same platform you play (PC, mobile, or console where supported). Codes apply to the account, not an individual bunker save slot, so Shards and potions follow you across sessions and multiplayer lobbies.
Step-by-step redemption
1. Join the experience
Open Defend Bunker from Zombies and load into the bunker hub or your active session. Wait until the main UI finishes loading; redeeming during a black loading screen can fail silently on some devices.
2. Open the Shop or Codes button
Primary path: Locate the Shop button on the primary HUD — usually accessible from the bunker menu alongside classes, crafting, and settings. The Shop is where Robux purchases and Shard spending also live.
Alternate path: Some players report a Codes button near the top of the HUD on certain builds. Tapping it should open the same promo redemption flow without hunting inside Shop tabs. If you see both, either works — you are not double-redeeming by opening twice.
3. Find the codes box
If you opened Shop, scroll or tab until you see a codes, promo, or redeem text field. It is distinct from buying items with Shards or Robux — you are typing a free promo string, not selecting a product.
If you used the Codes button, the text field should appear immediately in the popup or panel it opens.
4. Enter the code exactly
Type the code with correct capitalization and no extra spaces:
UPDATE_01— grants 100 ShardsFREEPOTIONS— grants 3× X2 and 3× X3 Shards Potions
Mobile players should disable auto-correct; underscore codes often break when keyboards “fix” them.
5. Confirm and verify
Tap redeem or press enter. A success message should appear, and your Shard balance or potion inventory updates immediately. If the UI lags, close and reopen the Shop once before assuming failure.
Platform-specific tips
PC players can copy codes from this wiki or Discord and paste into the field — fastest for long codes. Mobile players may need to tap the field twice for the keyboard to appear; landscape mode helps see confirmation toasts. Console users on supported Roblox builds should use on-screen keyboard carefully; verify each character for underscore codes like UPDATE_01.
Multiplayer does not block redemption. You can redeem in a public squad lobby or solo private server alike. Redeeming before a coordinated night defense lets the whole group benefit if you spend Shards on shared upgrades — though potion buffs are usually per-player.
Troubleshooting invalid or expired codes
| Problem | Likely cause | Fix |
|---|---|---|
| ”Invalid code” | Typo or wrong case | Re-type manually; check underscore position |
| ”Expired” | Code rotated after update | See Codes Hub for replacements; join Discord via Links |
| No reward shown | UI delay | Reopen Shop; rejoin server |
| Works for friend, not you | Already redeemed | One-time codes cannot be claimed twice on same account |
| Error on mobile only | Keyboard autocorrect | Turn off autocorrect; re-enter |
If a code works for the community but not for you, you may have already claimed it during a prior event. Shards from UPDATE_01 do not stack from duplicate redemption — the server remembers account history.
After redeeming: smart next steps
Shards are best spent deliberately. New players coming from Getting Started should prioritize permanent progression — class unlocks or bunker upgrades — before cosmetic items. Potions from FREEPOTIONS expire or consume on use depending on current game rules; activate them when you can play through at least one full day loot / night waves cycle, not during a five-minute AFK check.
Pair redemption with learning core loops: daytime scavenging, Resource Management, crafting walls and traps from Base Building, and assigning rescued survivors from Survivors Guide. Codes accelerate meta progress; they do not replace understanding hunger, power, and wave timing.
Staying updated on new codes
Developers announce codes on the official Discord (https://discord.com/invite/T6zXPpu94m, also on Links) and sometimes on Roblox experience description updates. After each patch listed on Updates, rerun through the Codes Hub — we prune expired entries so you are not copying dead strings from old videos or social posts. See How to Get More Codes for Discord channel habits and milestone tracking.
Related pages
- Codes Hub — active code list (UPDATE_01 + FREEPOTIONS, Aug 2026)
- How to Get More Codes — where new STZ promos drop
- Shard Rewards Explained — Shards vs potions
- Getting Started — full beginner path after claiming rewards
Frequently Asked Questions
Quick answers to the most common questions.
Where is the codes box in Defend Bunker from Zombies?
Inside the in-game Shop codes redeem field, or via the Codes button some HUD builds show at the top. Neither path uses Roblox account settings.
Are codes case-sensitive?
Yes. Enter UPDATE_01 and FREEPOTIONS exactly as shown, including underscores and capitalization, or the game will reject them.
I redeemed a code but got no Shards. What happened?
Close and reopen the Shop, or rejoin the server. If still missing, you may have already redeemed that one-time code on this account.
Can I redeem codes on a new Roblox account?
If the code is still active globally, a fresh account can claim it once. Expired campaigns will not work regardless of account age.
Do I need Robux to redeem promo codes?
No. Promo codes are free. The Shop also sells Robux items, but the codes box is separate and costs nothing to use.
Should I redeem potions before or after joining friends?
Redeem whenever, but activate potions when you are ready to play actively. Boosted Shard gains waste downtime if you redeem then log off.