Is the Mines game rigged?

The short answer

The game itself isn't rigged in the way people usually mean. In Spribe's Mines each round's layout is fixed by seeds before you click, and you can check it afterwards. The payouts are set openly: 97% of fair on every click. What can go wrong is the casino around the game, and that's a different check.

How a round is fixed before you click

Spribe's Provably Fair window explains it in three lines:

"Round result is generated by combining Server Seed and Client Seed(with nonce)."

"Next, the combined string is converted to the SHA512 hash."

• The server seed is generated by the game's server and changes every round. Before the round, the Provably Fair settings show the next server seed as a SHA256 hash; the seed itself stays hidden until the round is over.
• The client seed is generated on your device. In Spribe's words: "You can change it anytime."
• The nonce is the round counter that the game adds to your client seed, so one pair of seeds doesn't keep producing the same layout.

Because the hash of the server seed is shown first, the server can't swap in a different seed after seeing your clicks. And because part of the input comes from your device, the server can't pick a layout in advance that suits it.

How to check a round

1. Before playing, open the Provably Fair settings and note the "Next server seed SHA256". Change your client seed if you like.
2. Play the round.
3. Afterwards, open the menu, then Bet History, then the round. Its Round Details show the mine field, your client seed and the revealed server seed.
4. Hash the revealed server seed with SHA256 and compare it with the hash you noted. They must match: that proves the seed wasn't swapped once you started clicking.
5. The last step, turning the combined SHA512 hash into mine positions, is where Spribe stops short. Its rules say the hash is converted to a decimal and then to "coordinates of the mines", but the exact conversion isn't published, so you can't rebuild the field yourself. Stake, by comparison, publishes its method (a Fisher–Yates shuffle over 24 random numbers).

Step 4 is the one anyone can do with a free online SHA256 tool.

What the check doesn't cover

• Payouts and withdrawals. A fair round is worthless if the casino won't pay. That's why a real withdrawal is part of the checks before a casino is listed here (how we verify).
• Fake games. The ACCC warned on 8 July 2026 that "Australians are being lured into fake online gambling and casino platforms that manipulate results, withhold 'winnings' and incentivise users into recruiting others." A copy made to look like Mines won't have Spribe's seed check at all.
• Limits and terms. Spribe's rules say the maximum win is limited by the operator. Read the casino's cap before a large cash-out.

Losing streaks aren't proof of rigging

Bad runs feel suspicious, but they are what the odds predict. With 3 mines, the first click hits a mine 12% of the time. Over 100 rounds you should expect about 12 first-click losses, and two in a row somewhere in those 100 rounds happens about 73% of the time. The odds calculator gives the numbers for any setting.