Are the original games at a crypto casino actually fair, or is the house quietly tilting the odds? At Duel we answer that with maths, not marketing. Our eleven in-house originals are provably fair, run at 100% RTP, and every result can be checked from the seeds after you play. Here's exactly how they work.
Play without ID checks up to $2,000/day.
On-chain withdrawals in ~3 minutes. No fees.
Half of every slot loss back, instantly.
Castle Roulette returns 100% on average.
Duel originals are the eleven games we designed, coded, audited and operate ourselves — not third-party titles wearing our logo. The current line-up includes Crash, Plinko, Mines, Dice, Blackjack, Video Poker, Castle Roulette and our newest release, Groomer's Van. Because we run them in-house, there's no external studio margin baked in and nothing hidden in the maths.
The headline number is the one most players double-check: our originals run at 100% RTP, meaning there's zero built-in house edge on the game itself. Castle Roulette is a clear example — a 0% house edge table, which simply doesn't exist in a traditional casino. That doesn't make gambling profitable over time (variance is real and it cuts both ways), but it does mean the game isn't quietly taking a cut on top of the odds you can see. It's the cleanest version of these classics we could build, and it sits right next to our 5,000+ slots from studios like Pragmatic Play, Hacksaw Gaming and Nolimit City.
"Provably fair" isn't a slogan — it's a cryptographic method you can audit yourself. Every round at Duel combines three values: a server seed (ours, hashed and shown to you before the bet so we can't change it afterwards), a client seed (yours, which you control) and a nonce (a counter that increases with each bet). Together these generate the result.
After you've played, we reveal the original server seed. You can then re-run the exact calculation — hashing the seeds and nonce — and confirm that the outcome you got is the only outcome those inputs could have produced. If we had tampered with a single spin, the hashes wouldn't match and the proof would fail publicly.
This is the honest answer to "is the 100% RTP a scam?" The RTP describes the game's design; provably fair lets you verify that the design is what actually ran. You don't have to trust our word, our brand or our reviews — you can check the receipt. That's a level of transparency most online casinos, licensed or not, simply can't offer.
We don't run a traditional welcome bonus with wagering traps. Instead, Duel returns a flat 50% rakeback — and yes, it applies to the originals too, not just slots. On games that already run at 100% RTP, that rakeback is pure value flowing back to your balance on every wager, win or lose, with no playthrough to clear.
That combination is deliberate. Most casinos give you the worst odds on their own "originals" and dress it up with a deposit match. We do the opposite: zero house edge on the game, plus half the rake back in your pocket. On top of that there's weekly cashback and a monthly slot race. The point isn't to dangle a one-time bonus — it's to make the long-term maths as friendly to you as we honestly can while still running a business.
The originals run on the same rails as the rest of Duel. Deposit in crypto — Bitcoin, Ethereum, Tether, Solana, Litecoin, Bitcoin Cash, Dogecoin or TRON — from as little as $1, and you're playing the moment the transaction confirms. There's no KYC up to $2,000 in winnings per day, so you can register with just an email and jump straight into Mines or Crash.
Withdrawals settle on-chain in about three minutes on average, with no platform fees beyond the network cost. A quick note on trust, because it matters: Duel operates under an Anjouan licence (ALSI-202411026-FI1) held by Immortal Snail LLC — that's an offshore licence, so you won't have the same local player protections you'd get from a regulator in your own country. The brand is publicly linked to Finnish entrepreneur Ossi Ketola and poker pro Patrik Antonius. Depending on where you live, winnings from an offshore casino may count as taxable income, so check your local rules. Play within your means, set limits, and treat the provably fair tools as your real safeguard.