findingEV
findingEV
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May 19th, 2026 at 9:06:40 AM permalink
Various online Mines games like Cleopatra Mines say they have an RTP of 94%. Yet if I have 1 mine out of 25 squares and bet $1, dodging that mine once returns $1.01, which at face value would appear to be a 96.96% RTP.

Do you all believe the game is rigged/not as it appears, or that the 94% RTP is an aggregate of various betting scenarios?

heatmap
heatmap
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May 19th, 2026 at 4:08:43 PM permalink
Just checking but you do realize RPT is not the same as win frequency?
findingEV
findingEV
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May 19th, 2026 at 4:11:44 PM permalink
Yes.

If the game plays "true", you would win 96% of the time in the setup pictured (if you quit after one guess), but your RTP would be 96.96%. (For every $25 spent, you would expect to get back 24 x $1.01 = $24.24.)

My question is: does the game play true?
Dobrij
Dobrij
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findingEV
May 20th, 2026 at 12:51:56 AM permalink
Yes, the first move's RTP is 96.96%. But in games like these, each move typically has its own EV, and the higher the win rate, the lower the RTP. Therefore, the manufacturer probably indicated the average RTP%
Marcky229
Marcky229
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July 10th, 2026 at 5:24:28 AM permalink
just dont be greedy when playing that games. 1.2-1.5 is already enough for me to cash out
Mental
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July 10th, 2026 at 7:50:44 AM permalink
Quote: Dobrij

Yes, the first move's RTP is 96.96%. But in games like these, each move typically has its own EV, and the higher the win rate, the lower the RTP. Therefore, the manufacturer probably indicated the average RTP%
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NO, this is not an average RTP. This is the optimal RTP that you can attain. You need to randomly select squares until you blow up or find all the non-mine squares to achieve this RTP. Nowhere in the rules do they say what the RTP is if you cash out early. It is probably similar. I know of games where the RTP is slightly lower for cashing out, but only because they game rounds the payoff down to the nearest penny (based on a dollar bet).

My guess (based on other similar games) is that they recalculate the cashout payoff after every selection based on the math of the game. They calculate the exact amount that would give you a 96.96% RTP, and then round down.

I suspect that the optimal EV is achieved by taking more risk because the penny rounding has a less negative affect on your cashout offer the higher the offer is. I have built math models of other games that shows that this is how those other games are constructed. I don't have any motivation to do the math for Mines. Maybe someone else can work it out.
Gambling is a math contest where the score is tracked in dollars. Try not to get a negative score.
findingEV
findingEV
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July 10th, 2026 at 7:54:07 AM permalink
So when it's a 5x5 board with 1 mine, just to clarify, do you think you will safely survive the first pick 96% (24/25ths) of the time on average? Is the game honestly picking one spot that has a mine and 24 safe spots?
Mental
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harris
July 10th, 2026 at 8:05:46 AM permalink
Quote: findingEV

So when it's a 5x5 board with 1 mine, just to clarify, do you think you will safely survive the first pick 96% (24/25ths) of the time on average? Is the game honestly picking one spot that has a mine and 24 safe spots?
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Again, I have not tested Mines, nor have I done the math. For other games where I have worked out the math assuming random placement, it agrees to the penny for payouts that are six significant digits. Mines apparently uses a table based on dollar bets, so the payoff for $1 might be $4.85 and the payoff for a $100 bet will be $485.00. That is, they do not give you the the $485.xx that the math would give you.

You can easily run auto play in demo mode and verify that the placements are roughly random (or not). I don't care to do this, but I have collected statistics on other games for days to understand how they work.
Gambling is a math contest where the score is tracked in dollars. Try not to get a negative score.
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