How to play Deal or No Deal online

The complete rules of Deal or No Deal on dond.win: pick a case, open the rest, take or refuse the Banker’s offer after every open. 25 cases from 0.1× to 10× your buy-in, free demo, real play with USDT or USDC.

The game in one minute

Deal or No Deal is a game of nerve. You hold one sealed case. You open the others one by one, and every open tells you something about what your own case can and cannot hold. After each open the Banker offers you money for your sealed case. Take the deal and the round ends. Refuse it and keep opening. If you refuse every offer, you win whatever is in your own case.

On dond.win the stakes are set by you. Every prize is a multiple of your buy-in, from 0.1× up to 10×.

Step by step

1. Set your buy-in. In demo mode you play with play money and can pick any amount. In real mode your buy-in is deducted from your USDT or USDC balance. There is a per-round cap on real buy-ins, shown in the buy-in panel.
2. Pick your case. 25 cases are shuffled. Each hides a different multiplier: 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.8, 0.9, 1, 1.1, 1.25, 1.5, 1.75, 2, 2.5, 3.5, 5 and 10 times your buy-in. Tap one. It stays sealed until the end.
3. Open the other cases. Tap any other case to open it. The prize inside is crossed off the board, because it cannot be in your case. Your first few opens are free; later opens cost a small fee (see below).
4. Answer the Banker. After every open the Banker calls with an offer for your sealed case. Press DEAL to take it and end the round. Keep opening to refuse it. The next open brings a new offer and the old one is gone.
5. The last case. If you open all 24 other cases without dealing, the round settles automatically and you are paid the multiplier in your own case.

What the Banker offers

The offer is not random. It is the average of the prizes still on the board, multiplied by a discount factor that starts low and rises as more cases are opened. Early offers are deliberately stingy; late offers get close to the true average. The exact formula is public, see How the Banker’s offer is calculated.

What it costs

Your buy-in is your stake. On top of that, each case you open past the free ones costs a fee expressed as a percentage of your buy-in. At the time of writing the first 3 opens are free, opens 4 to 10 cost 2% each and opens 11 to 24 cost 4% each. The game shows the fee before every paid open and asks you to confirm. The live schedule is published at /api/rules. More in Fees explained.

Demo first, real money when you want

The demo runs the same engine in your browser with play money. No wallet, no sign-up, no download. Real-money play uses USDT or USDC on Ethereum, BNB Smart Chain, Base or Solana, see Playing with crypto.

Every round is provably fair

Before you pick a case the server publishes a SHA-256 hash of its secret seed. Your own client seed is mixed into the shuffle. When the round ends both seeds are revealed and you can recompute the whole layout yourself on the verification page. Details in Provably fair, explained.