Seal Online makes its return on mobile devices with Seal M on CROSS. Leveling up and upgrading your gear takes considerable time, but developer promo codes give your character a handy head start without the extra grind.
Using free vouchers lets you claim bonus items directly to your inventory. Below, you will find all the current active codes along with instructions on how to use them.
Updated October 2026: We checked for new codes today. Make sure to claim the active offers below as soon as possible, as mobile coupon drops can expire at any moment.
All Seal M on CROSS Codes (October 2026)
Here are the active promo codes you can claim right now:
- 30DAYSANDMORE—Redeem Rewards
- SEALMCROSSLAUNCH—Redeem Rewards
Expired Seal M on CROSS Codes
These vouchers have ended their promo run and can no longer be redeemed:
- AprilFoolSeal
- 7DAYWITHSEAL
How to Redeem Codes in Seal M on CROSS
- Launch the game on your device and finish the opening tutorial.
- Open the main menu by tapping the icon in the upper corner of your screen.
- Head into the Settings menu and find the Account section.
- Tap the Coupon or Register Coupon option.
- Enter a valid coupon into the text box and confirm.
- Open your in-game mailbox to claim the sent rewards.
Why Your Code Isn’t Working
- Case sensitivity: Codes must match their exact capitalization. Typing errors or trailing spaces will cause the game to reject them.
- Expired vouchers: Developers set strict end dates for promos. Once that window shuts, the voucher stops working.
- Already claimed: Each gift code can only be redeemed once per account.
- Progression locks: Some promotional rewards require you to clear beginner quests before your mailbox unlocks.
How to Get More Seal M on CROSS Codes
The developers release fresh codes during milestone celebrations, server maintenance windows, and community events. To find them first, follow the game’s official social media pages, join the community Discord server, and watch for special livestream announcements. You can also bookmark this guide and check back often, as we update our list whenever new codes arrive.
