Written in-house
Not white-label skins. Duel builds, runs, and publishes the rules on every title in this lobby.
Made in-house · provably fair
Duel Originals
Nine games written by Duel, not rented from a slot aggregator. Each title publishes its RTP in the rules screen. Each round runs on a seed pair you can verify after the fact. No audit PDF you cannot reproduce. No 96% RTP slot dressed up as an "exclusive." This is the catalogue for people who read the math first.
In-house games
9
RTP floor
99%+
Castle Roulette edge
0%
Provably fair
Server seed committed before the round. Client seed you control. Recompute the outcome locally.
Edge on the label
RTP from 99% to 100% on the base game. The number in the rules screen is the number you verify.
Why Originals exist
Same casino, different contract with the player
Provider slots return 94-96% RTP on average and hide the RNG inside a lab certificate you never see. Duel Originals flip that: lower published edge, cryptographic proof per round, no third party between you and the math. The trade-off is a smaller catalogue. Nine games, not five thousand. Every one of them is listed below with RTP, volatility, and a link to the full guide.
A 96% slot and a 99% original both look like "casino games" in the lobby. On $1,000 wagered, the expected loss is $40 vs $10. Originals are where Duel puts the better number on the label and lets you check it.
Full catalogue
All nine Duel Originals
Click any tile for rules, strategy notes, and game-specific FAQ. RTP figures below are for the base game at default settings unless the guide says otherwise.
House edge
Published RTP on every title
Sorted by house edge on the base game. Side bets, if offered, carry their own published edge and are optional.
| Game | RTP | House edge | Volatility |
|---|---|---|---|
| Castle Roulette | 100% | 0% | Low |
| Blackjack | 99.5% | 0.5% | Low |
| Video Poker | 99.54% | 0.46% | Low-medium |
| Beef | 99.2% | 0.8% | Medium |
| Crash | 99% | 1% | Very high |
| Plinko | 99% | 1% | Configurable |
| Mines | 99% | 1% | High |
| Dice | 99% | 1% | Configurable |
| Keno | 99% | 1% | Medium |
Pick your game
Match volatility to the session you want
Low edge does not mean low swings. Castle Roulette and Blackjack are grind-friendly: small expected loss per hour, predictable bankroll drain. Crash and Mines can 10× or zero your stake in one round. Plinko and Dice let you dial variance from the bet panel. Keno and Beef sit in the middle for rotation nights.
Compare
Duel Originals vs provider slots
| Feature | Duel Originals | Provider slots |
|---|---|---|
| Typical RTP | 99-100% published | 94-96% industry average |
| RNG verification | Provably fair, per round | Lab audit, not reproducible |
| 50% slot rakeback | No (edge already baked in) | Yes, on provider slots |
| VIP wagering | Counts (0.5× tier) | Counts |
| Catalogue size | 9 titles | 5,000+ titles |
Provably fair
How every Original round is built
Three inputs: a server seed (hashed and committed before the round), a client seed (you set it or accept the default), and a nonce (increments each round). When the round ends, the server seed is revealed. Recombine the inputs, run HMAC-SHA-256, map the digest to the game outcome. If your result does not match what Duel paid, the round is void by policy.
Complete Duel Originals guide
Duel Originals reference: catalogue, edge, verification
This page is the index for all nine Duel Originals at Duel Casino: what each game is, published RTP, volatility profile, how provably fair works across the catalogue, and how Originals differ from provider slots and live tables. If you wanted a lobby map with numbers instead of ad copy, start here.
What are Duel Originals?
Duel Originals are proprietary casino games written and hosted by Duel, not licensed from Pragmatic, Hacksaw, or Evolution. The catalogue currently spans nine titles: Castle Roulette, Crash, Plinko, Mines, Dice, Blackjack, Keno, Video Poker, and Beef. Each runs on Duel's server, uses the same provably fair seed protocol, and publishes RTP in the in-game rules. They share one crypto wallet with slots, live tables, and sportsbook.
Why house edge matters more than marketing
RTP is return to player over a huge sample. A 99% game keeps $1 per $100 wagered in expected loss; a 96% slot keeps $4. Over a weekend session that gap is real money. Duel Originals are built to a 99% floor on the base game, with Castle Roulette at 100% and Blackjack at 99.5% when you follow basic strategy. The figures are in the rules screen, not buried in a help PDF.
How provably fair works across Originals
The protocol is identical across all nine games; only the mapping from HMAC digest to outcome changes. Before a round, Duel commits a hash of the server seed. You supply or accept a client seed. A nonce increments so every round is unique. After resolution, the raw server seed is revealed. Recompute HMAC-SHA-256 locally. Castle Roulette maps bytes to pocket 0-36. Crash maps to a crash multiplier. Mines maps to mine positions. If the recomputed result does not match the paid result, the wager is refunded.
Volatility by game
Castle Roulette and Blackjack are low variance: small swings, long sessions, edge grinds slowly. Video Poker and Beef sit low-to-medium. Keno is medium with lottery-style dry spells. Crash and Mines are high: one round can 100× or wipe the stake. Plinko and Dice let you choose variance from the panel without changing the 99% RTP target. Pick the game that matches how much swing you want in an hour, not just the lowest edge number.
Originals and the 50% slot rakeback promo
The 50% slot rakeback promo applies to provider slots only. Originals do not generate slot rakeback because they already run at 99-100% RTP. That is the trade. They still count toward VIP wagering volume, weekly cashback on net loss, and any Originals leaderboard promos running in the lobby. Castle Roulette at 0% edge is its own built-in discount.
Originals vs third-party slots
Provider slots offer volume and variety: thousands of themes, bonus buys, progressive jackpots. Originals offer transparency: published edge, provably fair verification, no hidden RTP skin. Many Duel regulars run slots for rakeback and variety, then switch to Originals when they want math they can audit. Same deposit, same withdrawal speed, different contract.
Blackjack in the Originals catalogue
Duel Blackjack is the single-deck in-house table with dealer stands on soft 17, 3:2 blackjack, and 0.5% house edge at basic strategy. It is provably fair with a fresh shuffle every hand, so card counting does not apply. For the full rules sheet, strategy chart, and FAQ, see the Duel Blackjack guide on this site.
Duel Originals on phone and tablet
All nine titles run in mobile browser and app wrapper with the same RTP, bet limits, and provably fair tools as desktop. Touch layouts for Crash cash-out, Mines tile picks, and Plinko drop are full-width. Seed verification works on mobile. There is no separate "mobile RTP" with worse rules.
Licence and disputes
Duel Casino operates under Anjouan licence ALSI-202411026-FI1. Provably fair disputes on Originals follow the published void policy: mismatched verification triggers a refund. For withdrawal limits, KYC thresholds, and account safety, see Help & FAQ.
Duel Originals FAQ
What are Duel Originals?
Nine in-house games built and operated by Duel Casino. They run on provably fair RNG, publish RTP in the rules screen, and sit in the Originals section of the lobby separate from third-party slots and live tables.
Are Duel Originals provably fair?
Yes. Every round uses a committed server seed plus your client seed and a nonce. After the round, you can recompute the outcome locally. See the fairness guide for step-by-step verification.
Do Originals count toward 50% slot rakeback?
No. Slot rakeback is funded by provider GGR and applies to third-party slots only. Originals already run at 99-100% RTP, which is the equivalent of baked-in value. They still count at 0.5× toward VIP tier progress and qualify for weekly cashback on net loss.
Which Duel Original has the lowest house edge?
Castle Roulette at 0% on the main wheel. Blackjack is next at 0.5% with basic strategy. Video Poker hits 0.46% with optimal holds.
Can I verify Originals rounds on mobile?
Yes. The same seed panel and verification tools ship in the mobile browser and app wrapper. Copy server seed, client seed, and nonce from settings and recompute on any device.
Originals vs Evolution live games: what is the difference?
Originals are software tables with published RTP and provably fair shuffles. Live games stream a human dealer from Evolution studios with physical cards and wheels. Same wallet, different math and verification model.
Is Castle Roulette really 0% house edge?
On the main European wheel, yes. The zero pocket is reseeded every spin so long-run return converges on 100%. Optional side bets (Voisins, Tiers, neighbours) carry their own published edge.
Do Originals count toward VIP tier?
Yes. Originals wagers count at 0.5× toward VIP tier progress (slots and live count at 1×). Weekly cashback on net loss can include Originals play at tiers from 5% to 20%. Details on the VIP page.
What is the minimum bet on Duel Originals?
$0.10 on most titles. Table caps vary by game and are shown in the lobby before you confirm a bet. High-limit tables exist for Crash and Castle Roulette.
Where do I find Originals in the Duel lobby?
Open the Originals tab or search by game name. Each title in this catalogue maps to one entry in that section. They are not mixed into the slots grid.
Open the Duel Originals lobby
Nine games. Published edge. Provably fair. Same crypto wallet as the rest of Duel.
Play Duel Originals