Checked: 24 September 2026 · casino lobbies, game interfaces, operator documentation and 100RTP.games audit data.
Current Status by Casino
We separate an offer visible in the casino from an older marketing claim, and a zero-edge state from a merely high-RTP game.
12 Originals carry the 100% RTP badge. Dice showed 99.90% base math while the account was inside the Zero Edge state, confirming that base pricing and the zero-edge account layer are separate.
Gamdom documents a zero-edge state for the first $5,000 wagered. Other operator material describes first-$50,000 return conditions without establishing the same percentage.
The former Zero House Edge range was absent from the casino lobby during our check, although MetaWin’s Terms and FAQ still retain older wording for the category.
A casino does not have one universal RTP. The useful comparison is the specific game, the mechanism producing the zero-edge result, the applicable limit and what happens when that state ends.
This page therefore starts with individual games and account conditions. For a platform-first comparison, use Zero-Edge Casino Platforms Compared. For the underlying mechanics, see How Zero-Edge Gambling Works.
Game-by-Game 100% RTP Availability
| Game or Group | Casino | Status | What Supports It | Important Condition | Evidence |
|---|---|---|---|---|---|
| Dice | Duel | Zero Edge state shown | A checked session showed 49.95% win probability at 2.0000x, equivalent to 99.90% base RTP. The simultaneous Zero Edge panel described eligible wagering as 0% edge. | $50,000 daily allowance and $1,000 bet limit were visible in the account panel. | Formula-level verified |
| Crash, Mines | Duel | Badge shown | The casino lobby and Duel’s Zero Edge rules support the claim. | These titles have not been re-audited formula-by-formula against the latest Zero Edge implementation. | Rules-supported |
| Plinko, Keno, Limbo, Rock Paper Scissors | Duel | Badge shown | All four appeared in the Duel Originals lobby with the same 100% RTP designation. | Game-specific distributions or paytables have not yet been independently reproduced. | Operator-stated |
| Castle Roulette live audit | Duel | Fair face paytable verified in tested Zero Edge state | We counted the 48-position wheel, reproduced the 24 / 12 / 6 / 3 / 2 / 1 distribution, confirmed the expected-value relationship, observed a $10 bet on 2x settle at exactly $20.00 and reproduced completed round #986542 from the disclosed verification inputs. | The game showed a $50,000 daily Zero Edge allowance and $1,000 bet limit. Duel states that a bet-size-based house edge applies after the allowance; that post-limit formula has not been independently measured. | Independently verified |
| Groomer’s Van | Duel | Badge shown | Duel documents Original slots separately and states that they are priced at 100% RTP while eligible. | A scaling house edge applies after the allowance. | Rules-supported |
| Video Poker | Duel | Badge shown; calculation conditional | Theoretical return additionally depends on the exact paytable and player strategy. | A dedicated paytable and strategy audit is still required. | Pending verification |
| Duel Blackjack Original | Duel | Badge shown; mechanism unresolved | Duel separately publishes Blackjack base-edge tiers from 0.10% to 0.57%. | The interaction between the Zero Edge state, higher tiers, splits and doubles is not fully documented. | Pending verification |
| Beef | Duel | Badge confirmed | The designation was visible in the lobby. | Game-specific economics documentation has not yet been located. | Pending verification |
| In-house games: first $5,000 band | Gamdom | Zero-edge state documented | Gamdom’s operator article and account interface describe a $5,000 daily Zero Edge allowance and 100% RTP treatment. | A separate operator document gives a different first-$50,000 description. | Rules-supported |
| Certain Originals: first $50,000 wording | Gamdom | Wider structure unresolved | A separate operator article describes approximately 99% native RTP plus an instant return on certain games for the first $50,000 wagered. | It does not establish that the same full offset continues throughout that band. | Pending verification |
| Pocket Dice | Gamdom | Conflicting official wording | Operator material separately presents Pocket Dice as 100% RTP while also grouping it inside a broader approximately-99% explanation. | Game-specific economics need reconciliation. | Pending verification |
| ZERO / Zero House Edge titles | MetaWin | Not found in casino | 27 regular Originals were displayed and a search for “zero” returned no results. | Terms and FAQ still contain Zero House Edge language. | Independently verified |
Evidence labels describe the specific claim in each row. A visible badge proves product presentation; it does not automatically prove every part of the underlying expected-value calculation.
Duel: 12 Originals With a 100% RTP Badge
The Duel Originals lobby showed the designation on 12 titles:
The checked account showed a $50,000 daily Zero Edge allowance. Duel Dice uses 99.90% base pricing, with the remaining edge removed while the Zero Edge state is active.
Affiliate link: 100RTP.games may receive a commission if you register. This does not affect the evidence grades or calculations on this page.
Duel Dice: Base Pricing and Zero Edge Are Separate Layers
The Dice interface exposes enough information to calculate its base return directly.
49.95% × 2.0000 = 99.90% base RTP
A mathematically fair gross multiplier at exactly 49.95% probability would be approximately 2.0020x. The observed 2.0000x therefore does not represent native 100% pricing by itself.
The more accurate interpretation is that Duel separates the game’s base math from the Zero Edge account state. Once the daily allowance is used, the interface explicitly says a 0.1% house edge applies until the next reset.
Published Blackjack Base-Edge Cost
Duel publishes several Blackjack base-edge tiers. The figures below show expected base cost before any Zero Edge adjustment.
| Published Base Edge | Base Cost per $10,000 Wagered |
|---|---|
| 0.10% | $10 |
| 0.14% | $14 |
| 0.27% | $27 |
| 0.57% | $57 |
These figures isolate the published base edge only. They do not establish the final effective Blackjack cost under every Zero Edge condition. See the Duel Blackjack Original audit for the unresolved rule and added-wager questions.
Gamdom: 100% RTP Is Documented, but the Wider Structure Is Unclear
Gamdom’s product and operator documentation confirm a zero-edge offer, but the operator publishes more than one description of the relevant wagering volume.
Gamdom advertises Zero Edge across its Originals. The checked account panel showed a $5,000 daily allowance, while separate operator documentation describes additional return conditions up to $50,000.
Affiliate link: 100RTP.games may receive a commission if you register. This does not affect the evidence grades or calculations on this page.
Gamdom states that its in-house games receive zero-edge treatment for the first $5,000 wagered. The account interface independently shows the same $5,000 daily limit.
A separate Originals article describes approximately 99% native RTP plus an instant return on certain games for the first $50,000 wagered, without specifying the same return percentage.
The two operator descriptions should not be merged into an assumed tier structure. The $5,000 state is directly shown; the relationship between that band and the separate first-$50,000 wording remains unresolved.
Current Gamdom Originals Lobby
The lobby we checked contained 11 in-house titles:
Pocket Dice deserves a separate warning because Gamdom’s operator material contains both a 100% RTP presentation for the title and a broader approximately-99% Originals explanation. We therefore leave its exact game-level economics unresolved.
MetaWin: ZERO Titles Were Not Found in the Casino
MetaWin therefore should not be presented as an active 100% RTP casino based on the checked product. The regular Originals now visible are positive-edge games rather than the earlier ZERO variants.
Its documentation has not fully caught up with that product state.
| Evidence | What We Found | Interpretation |
|---|---|---|
| Casino lobby | 27 regular Originals, no ZERO title | Strongest evidence of player-facing availability |
| Casino search | “zero” returned no results | No discoverable ZERO game in the interface |
| Regular Originals catalogue | Published RTP values below 100% | The regular range is not a zero-edge range |
| Terms | Still define Zero House Edge Originals and a $25,000 maximum win | Older legal/product wording remains |
| FAQ | Still says some MetaWin games have zero house edge | Documentation is not fully synchronized with the casino product |
We therefore describe MetaWin as a former ZERO range that is not found in the checked casino lobby, rather than calling the programme permanently discontinued.
For licensing, payments and the broader platform context, see the MetaWin audit. No affiliate CTA is shown here because we did not find an active ZERO product.
Where 100% RTP Ends: Post-Limit Pricing
A 100% RTP state can apply only to part of a session. Once the qualifying allowance is exhausted, expected return can fall even though the earlier eligible wagering was correctly treated as zero edge.
Blended RTP = (eligible volume × eligible RTP + post-limit volume × post-limit RTP) ÷ total volume
Duel: $75,000 Total Wagered
Using the allowance values visible in the Zero Edge panel:
- $50,000 at 100.00% effective RTP;
- $25,000 afterwards at 99.90% RTP.
(50,000 × 1.000 + 25,000 × 0.999) ÷ 75,000 ≈ 0.9997
Illustrative blended RTP ≈ 99.97%
Expected-value calculation only; it does not predict an individual session result.
The same calculation should not be imposed on Gamdom beyond its clearly shown $5,000 state because its other public material does not define one continuous effective-return schedule to $50,000.
MetaWin’s former model used a different constraint: a maximum-win cap. The RTP effect of such a cap depends on the payout distribution of the individual game.
100% RTP vs High-RTP Games
Pages about high-payout slots and 99%+ games answer a related but different question. A 99.5% or 99% game still carries a positive theoretical house edge.
| RTP | House Edge | Meaning |
|---|---|---|
| 100% | 0% | No theoretical casino advantage under the defined rules and conditions. |
| 99.5% | 0.5% | Very high RTP, but still a positive edge. |
| 99% | 1% | Low-cost relative to many games, but not zero edge. |
| 97% | 3% | A common level for crypto Originals. |
| 96% | 4% | Typical slot-style pricing. |
For the underlying definition, see What Does 100% RTP Mean?. To translate house edge into expected cost, use the Edge Cost Calculator.
How We Checked This Page
We checked whether the games or categories were actually visible in the casino rather than relying only on old reviews or indexed snippets.
Where possible, we compared visible game math with the operator’s Zero Edge or allowance state rather than treating a badge as mathematical proof.
Casino rosters, limits and promotional economics change. The findings on this page belong to the check date shown near the top.
For the complete framework, see the 100RTP.games Audit Methodology.
Evidence Levels
We directly checked and reproduced the specific claim being described.
The relevant game mathematics or expected-value relationship was calculated from observable inputs.
The claim is supported by product state plus documented rules, but has not been reproduced end to end.
An operator-controlled source supports the claim without independent reproduction.
A material part of the calculation, game-specific model or relationship between operator statements remains unresolved.
Primary Sources
- Duel Zero Edge FAQ — allowance and Zero Edge mechanics.
- Duel Economics Changelog — Blackjack base-edge tiers and game-specific changes.
- Gamdom News — operator article “Play ALL Gamdom Originals Games at 100% RTP”, last updated May 29, 2026.
- Gamdom King of the Hill Help Center — first-$5,000 wording.
- Gamdom Originals Help Center — approximately-99% RTP and first-$50,000 wording.
- MetaWin Terms — retained Zero House Edge definition and $25,000 cap.
- MetaWin FAQ — remaining zero-house-edge wording.
- MetaWin Originals catalogue — regular Originals and published RTP values.
When operator sources disagree, the disagreement is shown rather than silently resolved. Secondary casino reviews are not used as the source of truth for RTP, allowance thresholds or maximum-win figures.
Frequently Asked Questions
Do real 100% RTP casino games exist?
Yes. Duel shows a roster with the 100% RTP designation, while Gamdom documents a zero-edge wagering state. The mechanics and limits differ between operators.
How should the two Gamdom limits be interpreted?
They should not be merged into one assumed tier structure. One operator source and the account panel show a $5,000 Zero Edge state, while another article describes return mechanics on the first $50,000 without establishing the same percentage.
What happened to MetaWin’s ZERO games?
No ZERO-labelled title was found in the casino during our check, even though MetaWin’s Terms and FAQ still retain Zero House Edge wording. We therefore describe the range as not found in the checked product rather than permanently discontinued.
What happens when a 100% RTP limit is reached?
The result depends on the operator. Duel’s Zero Edge panel states that a 0.1% house edge, equivalent to 99.9% RTP, applies after its $50,000 daily allowance is used. Gamdom’s panel similarly states that its games revert to a 1% house edge / 99% RTP after the $5,000 daily allowance.
Bottom Line
The phrase “100% RTP casino” is useful as a search query, but the meaningful comparison lives one level deeper: the game, its base mathematics, the account-level mechanism, the applicable limit and the evidence that the offer still exists.
At the time of our check, Duel had the clearest visible zero-edge roster, with Dice showing 99.90% base pricing inside the Zero Edge state. Gamdom had a clearly displayed $5,000 daily allowance but inconsistent wider documentation. MetaWin’s former ZERO range was absent from the casino despite older Zero House Edge wording remaining in its documentation.
For deeper platform checks, see the Duel Casino audit and Duel vs Gamdom comparison.
