What the Developer Publishes
The official Mount RNG Roblox experience was read through the Roblox API on August 16, 2026. The developer description was last updated on August 15, 2026, one day before this check, and it lists exactly two codes under a heading of its own:
LESSON5 and CORTISOL. Nothing else.
That is the strongest signal available for this game, and it is first-party. It confirms CORTISOL, which until now rested on two tracker listings and was missing entirely from a third. It also means the Umamusume-themed codes that trackers have been splitting over are no longer advertised by the people who issue them. The same description states the game is on Update 50, version 1.50, and updates every two weeks.
Two caveats, so this is not oversold. A developer dropping a code from the description is strong evidence it is retired, but it is not a formal expiry notice, and no expiry date is published anywhere. And the description omitting a code does not by itself prove that code is dead, which is why FORTNIGHT and SIGH stay in the table below with a flag rather than being deleted.
Codes to Check First
| Code | Reward / Signal | Status |
|---|---|---|
| LESSON5 | Johnny Joestar mount per Pocket Tactics and Roblox Den; Beebom says only an exclusive mount. The developer names the code but no reward | Published in the developer's own game description (August 15) and carried by all three trackers. The best-supported row on this page |
| CORTISOL | A Low Cortisol exclusive mount | Published in the developer's own game description (August 15). Also listed by Roblox Den (August 16) and Beebom (August 1). Pocket Tactics (August 12) still carries no entry for it either way, which no longer matters much now the developer lists it |
| FORTNIGHT | Battle Bus mount | All three trackers still list it as working, but the developer's August 15 description does not include it. Trackers agree, the source of truth is silent |
| SIGH | The old Floating Cube mount per Pocket Tactics and Beebom; Roblox Den states no reward detail | All three trackers still list it as working, but the developer's August 15 description does not include it. Trackers agree, the source of truth is silent |
Sources checked August 16, 2026: the official Mount RNG Roblox experience (developer description last updated August 15, 2026, listing LESSON5 and CORTISOL), Roblox Den (its own stated update: August 16, 2026), Pocket Tactics (its own stated update: August 12, 2026), Beebom (its own stated update: August 1, 2026). GGGuides labels these as dated signals unless confirmed in-game.
Reported Expired
Rows leave the table above rather than being deleted, so returning readers can see what changed.
| Code | What changed | Status |
|---|---|---|
| URARA, UMAMUSUMEAGAIN, UMAMUSUME | Moved down on August 16. All three were disputed rows on this page. Roblox Den, freshly updated on August 16, now files all three as expired, and it has picked up UMAMUSUME, which it previously did not carry at all. More importantly the developer's own August 15 description lists two codes and none of these is among them. Pocket Tactics (August 12) and Beebom (August 1) do still show all three as working, so this is not unanimous, but a stale tracker does not outweigh the developer | Dropped from the developer's own code list |
| DINO, GOOSE | Beebom (August 1) still lists both as working mount codes. Pocket Tactics (August 12) and Roblox Den (August 16) both file them as expired, and the developer does not list them | Reported expired by the two fresher lists |
| 10KLIKES | Roblox Den (August 16) still shows a row for it, flagged for checking, attaching a 12,000 Essence reward. Pocket Tactics and Beebom both file it as expired, and the developer does not list it. As a milestone check: the live counter on the Roblox page read 244,141 likes on August 16, so the ten-thousand-like milestone was passed long ago and its reward window has almost certainly closed with it | Reported expired; milestone long since passed |
| LIKES500LOL, SPOOKY13, RICHLIKETHAT, 1MILVISITS | Carried on this page in July. Pocket Tactics (August 12), Beebom (August 1) and Roblox Den (August 16) all place them in their expired tables | Reported expired |
How to Redeem
- Open Mount RNG from the official Roblox experience page.
- Find the Codes, Shop, Rewards, or Settings menu after your character loads.
- Paste one code exactly as shown, including numbers and capitalization.
- If it fails, rejoin a fresh server and check whether the code expired, requires a level, or was already redeemed.
Why a Code May Fail
Common causes include expired milestone rewards, old servers, typo-sensitive capitalization, one-use redemption, region or group requirements, and update delays.
Update Rule
We do not mark a code as active just because another page says it is active. The page records what was checked, when it was checked, and what players should verify next.