Written in-house
Duel builds, runs, and publishes the rules. Not a white-label skin with a new logo slapped on.
Made in-house · provably fair · edge on the label
Duel Originals
Eleven games Duel wrote itself, not rented from a slot aggregator. Each title prints RTP in the rules screen. Each round runs on a seed pair you can verify after the fact. No audit PDF you cannot reproduce. This page is the map: every game, every edge number, and a link to the full guide.
In-house games
11
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 this lobby exists
A smaller catalogue with better numbers on the sticker
Provider slots average 94-96% RTP and hide the RNG inside a lab certificate you never see. Duel Originals flip that trade: fewer titles, lower published edge, cryptographic proof per round. You give up volume for honesty. On $1,000 wagered, expected loss on a 96% slot is about $40. On a 99% original it is about $10. Castle Roulette on the main wheel is 0%.
Provably fair proves the round was not tampered with. It does not remove a built-in margin by itself. Duel puts the margin on the label instead of inside the odds.
Full catalogue
All eleven Duel Originals
Tap a tile for rules, strategy notes, and game-specific FAQ. RTP below is for the base game at default settings unless the guide says otherwise.
Deep guides
Every Original, explained
Eleven standalone guides with rules, RTP, and cross-links.
Castle Roulette
Castle Roulette is European roulette with the zero pocket reseeded every spin. Main wheel RTP is 100%. Even-money outside bets behave like a fair coin over huge samples. Side sectors carry their own edge if you turn them on. Pair with Blackjack for low-variance table nights or read Keno if you prefer draw pace.
Blackjack
Blackjack is the skill Original: single deck, dealer stands soft 17, 3:2 naturals, 0.5% at basic strategy. This guide includes the payout table and hard-totals chart. Close cousin Video Poker at 99.54% if five-card holds feel lighter. Avoid confusing this with live 6:5 tables in the main lobby.
Video Poker
Video Poker runs Jacks or Better. Optimal holds hit 99.54% RTP. Max coins matter for royal pay. Wrong holds hurt faster than the 0.46% label suggests. Compare decision load with Blackjack or switch to zero-decision Beef for volume.
Rock Paper Scissors
Rock Paper Scissors is 1v1. Duel does not rake the pot. For house-edge grinding use Beef or Blackjack. For head-to-head fun with seed verification, this is the title.
Groomer's Van
Groomer's Van is Duel's in-house scatter slot: tumbling wins, free spins, optional bonus buy at 125× where enabled. Base RTP is on the label; buy-feature RTP may differ. Similar swing appetite as Plinko high risk or Crash feature hunting.
Beef
Beef: one card each, higher rank wins at 1.97×, ties push. Zero decisions, 99.2% RTP, fastest dealer Original. PvP alternative: Rock Paper Scissors. Volume alternative: Dice auto-bet.
Crash
Crash rises until it busts. Cash out or lose the bet. 99% RTP, 1% edge, very high variance. Siblings: Plinko without timing, Mines with multi-tile tension.
Plinko
Plinko: pick rows and risk, drop the ball, collect the slot. RTP 99% on every config. Teaching cousin Dice. Slot cousin Groomer's Van.
Mines
Mines: mines on a 5×5 grid, reveal safe tiles, cash out anytime. 99% RTP. Pick target multiplier before tile one. Lottery cousin Keno.
Dice
Dice shows win probability and multiplier before every roll. Best intro to how RTP works across the lobby. Leads naturally to Crash and Plinko.
Keno
Keno: pick up to ten numbers, twenty drawn from eighty. Pick count sets variance, RTP stays 99%. Calmer table: Castle Roulette at 0% on the main wheel.
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 | Type |
|---|---|---|---|---|
| Castle Roulette | 100% | 0% | Low | Table |
| Blackjack | 99.5% | 0.5% | Low | Cards |
| Video Poker | 99.54% | 0.46% | Low-medium | Cards |
| Rock Paper Scissors | 100% | 0%* | Low | PvP |
| Groomer's Van | 100% | 0-0.015% | Medium-high | Slot |
| Beef | 99.2% | 0.8% | Medium | Instant |
| Crash | 99% | 1% | Very high | Instant |
| Plinko | 99% | 1% | Configurable | Instant |
| Mines | 99% | 1% | High | Instant |
| Dice | 99% | 1% | Configurable | Instant |
| Keno | 99% | 1% | Medium | Lottery |
*Rock Paper Scissors is PvP with no house rake on the pot. Duel earns from volume elsewhere, not from the match pot itself.
Pick your game
Match volatility to the session you want
Low edge does not mean low swings. Castle Roulette and Blackjack are grind-friendly. Crash and Mines can 10× or zero your stake in one round. Plinko and Dice let you dial variance from the bet panel. Groomer's Van is slot variance with scatter pays. Rock Paper Scissors is the calmest format if you want zero house margin.
Pick by goal
Which Original fits your session
Eleven titles, different variance and skill load. Start here if the full catalogue feels wide.
Lowest published edge
Castle Roulette at 0% on the main wheel, then Blackjack at 0.5% with chart play, then Video Poker at 99.54%.
Zero house margin on the contest
Rock Paper Scissors is PvP with no Duel rake on the pot. Break-even between matched players.
Skill and charts
Blackjack basic strategy and Video Poker hold chart. Wrong clicks cost more than the label edge.
High variance, one decision
Crash cash-out timing, Plinko config-only drops, Mines tile chains. All 99% RTP, very different swings.
Volume grinding
Beef auto-play and Dice low-target rolls. Fixed edge, high hand count.
Slot pace, provably fair
Groomer's Van scatter pays and tumbling wins. In-house slot with the same seed receipt as table games.
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 tier progress | Counts at 0.5× | Counts at 1× |
| Catalogue size | 11 titles | 5,000+ titles |
Head to head
Duel Originals vs typical crypto Originals
Many crypto casinos ship an "Originals" lobby. The games look similar. The math often is not. A common setup keeps roughly 1% house edge on every bet while still calling the engine provably fair. Verification only proves the round was not changed after you bet. It does not remove the margin baked into the odds.
| What matters | Duel Originals | Typical crypto Originals |
|---|---|---|
| Base house edge | 0-1% published per title | ~1% on most titles |
| Theoretical RTP | 99-100% on label | ~99% |
| Long-run expectation | Break-even math on lowest-edge tables | House ahead over huge samples |
| Provably fair | Dual-seed HMAC-SHA256 | Yes, edge still applies |
| Blackjack rules | Single deck, 3:2, 0.5% with strategy | Varies, often 6:5 on low limits |
| Cashback model | Rakeback + weekly VIP cashback | VIP tiers, edge unchanged |
Both let you verify a round. Only Duel publishes the lowest edges on the label and built the catalogue around that idea.
Figures reflect publicly documented Duel Originals RTPs and typical crypto-Originals margins. Always read the in-game rules screen before you bet.
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-SHA256, map the digest to the game outcome. If your result does not match what Duel paid, the round is void by policy.
- Copy the server seed hash before you bet. That is the commitment Duel must honour when the seed is revealed.
- Choose a client seed or keep the default. Note the nonce for the round you are about to play.
- After settlement, reveal the server seed and run HMAC-SHA256 with client seed and nonce.
- Apply the game-specific mapping from the rules screen. Pocket, card, multiplier, or tile must match exactly.
Honest limits
What this lobby is not
Eleven games is a small library next to 5,000 slots. Duel is crypto-first. Some titles carry higher variance than the edge number suggests. Beef sits near 99.2% RTP, not 100%. Groomer's Van and Castle Roulette can carry side features with their own published edge. Read the rules screen for the table you are on. None of that makes the math secret. It means you should pick the title that matches your bankroll and patience.
- Small catalogue by design, quality over volume
- Crypto-only banking on standard accounts
- Side bets and bonus features may carry their own edge
- Anjouan licence, lighter touch than UK or Malta
4.8
out of 5
Bottom line
Best-in-class transparency for in-house games
Published RTP, real provable fairness, and guides that match the rules screen. Marked down only for catalogue size and crypto-only rails, not for how the games are built.
Complete Duel Originals guide
Duel Originals reference: catalogue, edge, verification
This page indexes every Duel Original at Duel Casino: what each game is, how house edge compares to provider slots, how provably fair verification works, and where to read the deep guide for each title. Written for players who check the math before they click bet.
What are Duel Originals?
Proprietary casino games written and operated by Duel, separate from the 5,000+ third-party slots and Evolution live tables in the main lobby. The line-up spans table games, instant games, one PvP title, and one in-house slot. All use the same dual-seed provably fair protocol unless the guide notes a live-dealer exception (there is none in this catalogue).
Why published house edge matters
RTP is return to player over a huge sample. A 99% game keeps $1 per $100 wagered on average. A 96% slot keeps $4. Duel prints the number in the rules screen and lets you verify rounds independently. That combination is rare in online casinos.
Provably fair in one paragraph
Before each round the server commits a hashed seed. You supply a client seed. A nonce counts bets. After the round the server reveals the seed so you can recompute the outcome. See the fairness section on this page for verification steps.
Volatility by game type
Castle Roulette, Blackjack, and Rock Paper Scissors are low-variance formats. Crash, Mines, and Groomer's Van can swing hard in one round. Plinko and Dice let you choose risk from the panel. Match the game to session length and bankroll, not just the edge number.
Originals and slot rakeback
The 50% slot rakeback promo applies to provider slots only. Originals already run at 99-100% RTP. They count at 0.5× toward VIP tier progress in your Duel account and qualify for weekly cashback on net loss.
When to play Originals vs slots
Pick Originals when you want the lowest published edge and per-round verification. Pick provider slots when you want theme variety, feature buys, and the 50% rakeback promo. Same wallet, different contract with the math.
Groomer's Van and Rock Paper Scissors
Groomer's Van is Duel's in-house scatter-pay slot with tumbling wins and bonus buy. Rock Paper Scissors is PvP with no rake on the pot. Both use the same provably fair engine as the table and instant titles.
Originals on mobile
All eleven titles run in the mobile browser and app wrapper with the same rules, seed tools, and RTP labels as desktop.
Licence and disputes
Duel Casino operates under Anjouan licence ALSI-202411026-FI1. If verification fails on an Original, open a ticket with the round ID. Mismatch voids the round and refunds the wager by policy.
Duel Originals FAQ
What are Duel Originals?
Eleven in-house games built and operated by Duel Casino. They run on provably fair RNG, publish RTP in the rules screen, and live 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 section on this page.
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. They 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. Rock Paper Scissors has no house rake on the PvP pot.
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% edge?
On standard inside and outside bets on the main wheel, yes. Side bets like Voisins carry their own published edge. The 0% figure is for the base European layout.
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%.
What is the minimum bet on Duel Originals?
$0.10 on most titles. Table caps and max wins are shown in-game before you confirm a bet.
Where are Duel Originals in the lobby?
Open the Originals tab, or search by game name. Each title in this catalogue links to its on-site guide and to Duel Casino via the Play buttons.
What is Groomer's Van?
Duel's in-house scatter-pay slot: 6 reels, tumbling wins, free spins, and bonus buy. Published RTP up to 100% on the base math. Full guide on the Groomer's Van page.
How does Rock Paper Scissors work?
You match against another player in 1v1 rounds. Duel takes no rake from the pot, so the contest is between the two players, not against a house edge on the match itself. Guide: Rock Paper Scissors.
Open the Duel Originals lobby
Eleven games. Published edge. Provably fair. Register in under a minute.
Play Duel Originals