Harpoon a Fish codes
MONSTER is the live code, published in the game's own Roblox description, and it pays 3,000 XP plus 3 Ruby Keys. Codes are entered in the in-game Settings window, and the field is case sensitive.
One code is live in the current build, and it is published by the game itself rather than by a code aggregator. Here is the whole list, the reward, and how to redeem it without falling for a fake.
Working codes
| Code | Reward | Where it comes from |
|---|---|---|
MONSTER | 3,000 XP and 3 Ruby Keys | The official Harpoon a Fish description on Roblox; also listed by Gamerant and UrGameTips |
That is the entire list. The official game page still carries the line Use Code: MONSTER to get +3k XP and +3 Ruby Keys, which is the strongest possible source for a Roblox code: the developer published it on the game's own store page.
How to redeem a code
- Launch Harpoon a Fish and load into a server.
- Open the Settings window from the side menu on the island.
- Find the code box inside Settings and type
MONSTER. - Submit. The XP and Ruby Keys land in your account immediately.
If the code is rejected, the usual causes are a stray space copied from a web page, or the reward already being claimed on that account. Casing is not the problem - the code was redeemed in lower case in a 16 October 2026 walkthrough video, and it was accepted.
What the reward is actually worth
- 3,000 XP is a real head start: XP is what levels your diver, and levels feed the weight that lets you sink further.
- 3 Ruby Keys are the reward currency the game hands out for codes and claims. See Ruby Keys for what else tops those counters up.
Neither of them is a shortcut past the depth gate - the code speeds up the first hour, it does not buy you the deep bands.
Where the next code will appear
The developer publishes codes in the game's own description field, which is where MONSTER came from, and that page is the only source this site treats as confirmed. Aggregator sites, video titles and thumbnails quote codes freely; if a code is not on the game page and not reproducible in the Settings window, this site does not list it.
Expired codes
No expired Harpoon a Fish codes are listed here. The game launched on 28 August 2026 and is still pushing updates in October 2026, so there has not yet been a code worth retiring - when one stops working, it will move to a dated row at the bottom of this page rather than disappearing.
A last note on code sites
Every code page for this game, including this one, is quoting the same single line from the same official source. If a page tries to sell you a "code generator", it is not a code - it is a scam, and it does not need your password. The only thing a real code needs is the Settings box in the game.
