Undead Mayhem Codes

The undead have taken over the world in Undead Mayhem, and it's time to fight back! To survive waves of zombies attacking my hideout, I used these Undead Mayhem codes to upgrade my survivor's stats and get new weapons.

The codes for Undead Mayhem will help you reach higher levels by giving you XP buffs, cash boosts, or more Zombux to spend on cool weapon skins. With the best weapons, the undead will stand no chance against you and your team, giving you the firepower you need to come out on top. If tower defense games are your thing, use Zombie Invasion Tower Defense codes to cancel the undead apocalypse.

All Undead Mayhem Codes List

Undead Mayhem Codes (Working)

• update3—Redeem for 10 Minute XP Buff
• update2—Redeem for 10 Minute XP Buff
• 9000LIKES—Redeem for 250 Zombux
• luckytuesday—Redeem for 30 min XP Buff
• timetofarm—Redeem for 30 min XP Buff
• casualxpbuff—Redeem for 20 min XP Buff
• HAPPYUPDATE1—Redeem for 10 Minute XP Buff
• 1250LIKES—Redeem for 200 Zombux
• SUNDAYGRIND—Redeem for 30 Minute XP Buff and 250 Zombux

Undead Mayhem Codes (Inactive)

• 500LIKES
• HAPPYMONDAY
• RELEASE
• FREECASHBUFF

Related: Zombie Uprising Codes

How to redeem codes in Undead Mayhem

1. Launch Undead Mayhem on Roblox. 
2. Click on the Weapons button on the left-hand side of the screen.
3. Enter working codes into the Enter code here... text box.
4. Click on the Redeem button to claim your free reward. 

How to get more Undead Mayhem codes

Every time new codes for Undead Mayhem appear, we'll add them to this page, so bookmark it and check back often. You can also join the official Undead Mayhem Discord Server and Undead Dev. Roblox Group to keep tabs on any new codes and promos. Finally, follow the developers' X (Twitter) profile @inventionrunner and the official YouTube channel @AuthenticVault.

Why are my Undead Mayhem codes not working?

If you keep getting the "Code is invalid" message after trying to redeem your codes, check your codes' spelling and casing beforehand or paste them straight from the codes section above into the redeem codes text box. On the other hand, getting the "Code is expired" message means you're too late to redeem those codes.

Other ways to get free rewards in Undead Mayhem

Log into the Undead Mayhem every 24 hours to receive a free daily spin, and use it for a chance to win Zombux, cash, guns, skins, or more free spins. The second-best way to win free rewards is to play the game for 4 hours, granting you more free spins. Don't worry; you don't have to do anything; you just have to be in the game to receive those rewards.

What is Undead Mayhem?

Undead Mayhem is a third-person team shooter tasking you with defending the abandoned hospital from an invasion of the undead. The game lets you team up with three other players as you take on waves of zombies, each weave becoming more challenging. Every defeated zombie gives you cash to spend on weapon upgrades and ammo refills, and tougher zombies will also drop grenades and health refills.

If you or your teammate gets injured, the other teammates have 60 seconds to revive them. Otherwise, the fallen teammate will have to wait until the end of the wave to respawn. To increase your chances of survival, keep building barricades and stick with your team. If you need more help, don't hesitate to use Undead Mayhem codes.

If you're looking for codes for other games, we have many in our Roblox Game Codes post! You can also get a bunch of free stuff via our Roblox Promo Codes page.