If you've been stuck in Zenless Zone Zero but lack resources, do not panic. Luckily, miHoYo has been kind enough to put out free codes you can redeem in-game, which can help you get various rewards.
These rewards can help you get hands-on resources such as Polychrome, Dennies, and Investigator Logs, which are helpful if you want to progress in your game. Be warned, though. They have a limited amount of time for you to use them before they expire and will no longer give you rewards if you try to redeem them in Zenless Zone Zero.
These codes can only be redeemed once per account, so you won't be able to get these rewards more than once if you try to redeem them multiple times.
Due to the layout of the menus in the game, it may seem a little bit daunting trying to figure out how you are meant to redeem codes in Zenless Zone Zero. Don't panic; these steps will walk you through how to get your hands on those free resources.
First and most importantly, you need to reach Inter-Knot level 5. This is quickly done and can be done within the first couple of hours of the game or less.
Compared to other HoYoverse games, you won't need to unlock the mailbox function, as it will already be available as soon as you start playing Zenless Zone Zero. This is where your rewards will go once you have redeemed them.
You can also redeem the codes via the Zenless Zone Zero website. To do this, you must log in to your HoYoverse account.