Probability Breakdown
With M mines on a 25-tile grid, the probability of surviving N reveals is: ∏(k=0 to N-1) [(25-M-k)/(25-k)]. For example, with 5 mines, first reveal survival is 80% (20/25), second is 78.9% (19/24). The multiplier at each step is 0.97 / cumulative_survival_probability — ensuring the house keeps its 3% edge.
House Edge Explained
Mines has a 3.0% house edge (97.0% RTP). The multiplier for each tile reveal is calculated as the fair multiplier (1 / survival_probability) multiplied by 0.97. This means every additional tile you reveal has a mathematically fair payout minus the 3% house cut.
What Does This Mean for You?
With an RTP of 97.0%, for every 100 coins you wager on Mines, you can expect to get back approximately 97.0 coins over thousands of rounds. The remaining 3.0% goes to the house.
This is a long-run average. In any single session, your results will vary wildly — that's the variance (volatility: Medium). Short sessions can see 50%+ swings in either direction. The RTP only converges over thousands of rounds.
Rookie's provably fair system means you can verify these odds yourself. Every round is cryptographically determined before you play, and the math is public. No hidden RNG, no server-side manipulation.