Legacy Kollection hidden characters and unlocks
Which version hides which fighter, the conditions the game itself states, and the official No More Secrets shortcut.
Applies to: Secret fights in Legacy Kollection
Quick answer
Legacy Kollection states the unlock conditions itself. Its achievement list names the version and the fighter for each secret fight: Reptile in Mortal Kombat, Jade and Smoke alongside Noob Saibot in Mortal Kombat II, Smoke and Noob Saibot in Mortal Kombat 3, Noob Saibot again in Ultimate Mortal Kombat 3, Tremor in Special Forces, and the Fire God and the T-Rex Rider in Mythologies. The collection also includes No More Secrets, an official option that unlocks the hidden characters and opens the developer menu.
How secrets work here
Most guides to Mortal Kombat secrets were written for the original arcade releases and copy conditions forward without saying which version they apply to. Legacy Kollection lets us do better, because the collection states the conditions itself.
Its achievement list names a version and a fighter for every secret opponent, which turns the question of “how do I unlock Reptile” into a question with a documented answer: unlock him in the version that has him. That version-by-version mapping is the spine of this page.
Arcade secret fights
These are the secret opponents in the arcade builds, with the completion figure for each achievement in the collection. The percentages are useful as a difficulty signal: they show how many players have managed the fight.
| Fighter | Version | Achievement | Players who have it |
|---|---|---|---|
| Reptile | Mortal Kombat (arcade) | Fighting Viper | 8.2% |
| Jade | Mortal Kombat II (arcade) | Emerald Assassin | 8.0% |
| Smoke | Mortal Kombat II (arcade) | Vapor Trail | 6.5% |
| Noob Saibot | Ultimate Mortal Kombat 3 (arcade) | Ohhhh, Backwards! | 6.4% |
| Noob Saibot | Mortal Kombat II (arcade) | Out of the Shadows | 6.2% |
| Smoke | Mortal Kombat 3 (arcade) | Clouded Judgement | 4.0% |
| Noob Saibot | Mortal Kombat 3 (arcade) | The Ninja Who Wasn’t There | 3.9% |
Noob Saibot appears three times across the arcade games, which is why three separate achievements exist for him. If you are hunting a specific one, check the version column rather than assuming the fight works the same way in all three.
Mythologies and Special Forces
The remaining secret opponents sit in the two spin-off titles, and they are the rarest achievements in the collection — which tells you how few players have reached them.
| Fighter | Version | Achievement | Players who have it |
|---|---|---|---|
| The Fire God | MK Mythologies: Sub-Zero | Roasty Toasty | 4.0% |
| The T-Rex Rider | MK Mythologies: Sub-Zero | Cretaceous Konqueror | 3.5% |
| Tremor | MK: Special Forces | Seismik | 2.5% |
Tremor’s fight in Special Forces is the single rarest of the group at 2.5%. That is partly because Special Forces is the least played title in the collection, and partly because the fight is buried inside it. If you want the complete set, this is the one to plan around rather than stumble into.
No More Secrets
The collection ships with an official shortcut that changes how you approach all of the above, and it is worth knowing about even if you intend to unlock everything the hard way.
- No More Secrets is one of the five features Digital Eclipse listed for the collection. It unlocks the hidden characters and the developer menu directly.
- Because it is an official in-game option rather than a modified build, using it does not put you outside the game. What it does affect is the achievement list: the achievements track the fights themselves, so skipping the fights skips the achievements attached to them.
- If your goal is the full achievement set, treat No More Secrets as a convenience for casual play rather than a shortcut to a complete list.
Sources and review scope
- Steam — Legacy Kollection achievement list — used for the version and fighter named against each secret-fight achievement.
- Digital Eclipse — Online Arcade update — used for the change to the Noob Saibot secret fight and the training additions.
- Steam store listing — used for the No More Secrets feature description.
- Digital Eclipse — Legacy Kollection game page — used to confirm the feature list.
The fighter-and-version pairings come from the collection’s own achievement list, which is the developer’s own labelling rather than a community reconstruction. Exact controller inputs and the specific in-game conditions for triggering each fight are not reproduced here: they vary by version and are shown inside each game’s own move and menu screens. Completion percentages are the global Steam figures at the time of checking and will rise over time.
Checked against linked Digital Eclipse updates, Atari and Steam store listings, and the in-game achievement list on October 13, 2026. Dynamic details such as player counts and patch state should be rechecked before publication.
Not independently play-tested. This is not a claim that every platform or game version was tested. Source review: Oct 13, 2026.
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