Arknights: Endfield has an official redeem-code system, but codes are time-limited and rotate fast — many expire within days. We publish the reliable redemption method rather than stale code lists.
How to redeem
In-game: Settings > Platform & Account > Exchange Code, then enter the code (case-insensitive). You must first finish the 'Process: Cold Start' prologue and progress until the mailbox unlocks, since rewards are delivered by mail. Mail expires in 30 days.
Where real codes come from
Watch the official channels — in-game mail, the official Discord/social accounts and the official site (endfield.gryphline.com/en-us). Ignore third-party "active code" lists — they go stale quickly.