Mines review
Mines is a Spribe instant game from the seven-title Turbo Games pack released on 14 June 2019. Its 5×5 board hides stars and mines under closed tiles. Choose a stake and mine count before the round; the standard table covers one to twenty mines, with three as the default. Reveal tiles manually or with the random-pick button. Each star raises the payout; one mine finishes the round without a payout. Cash out is available after every safe pick.
The paytable and sequence probabilities
Parentheses below show the probability of finding the entire stated sequence, rather than just its final pick. With three mines, the first pick is safe with probability 22/25 = 88%; after four stars, the fifth is 18/21 ≈ 85.7%. The mines remain while the number of safe closed tiles falls.
1 — 1 star: 1.01x (96%); 3 stars: 1.10x (88%); 5 stars: 1.21x (80%); 10 stars: 1.61x (60%).
3 — 1 star: 1.10x (88%); 3 stars: 1.44x (67%); 5 stars: 1.95x (49.6%); 10 stars: 4.90x (19.8%).
5 — 1 star: 1.21x (80%); 3 stars: 1.95x (49.6%); 5 stars: 3.32x (29.2%); 10 stars: 17.16x (5.7%).
10 — 1 star: 1.61x (60%); 3 stars: 4.90x (19.8%); 5 stars: 17.16x (5.7%); 10 stars: 1,055.84x (0.09%).
20 — 1 star: 4.85x (20%); 3 stars: 223.10x (0.43%); 5 stars: 51,536.10x (≈ 0.002%); 10 stars: —.
The table is symmetric: three mines and ten stars give 4.90x at about 19.8%, as do ten mines and three stars. Five mines and ten stars match ten mines and five stars:17.16x at about 5.7%. This equates probabilities and coefficients, but not the number of intermediate cash-out opportunities.
For m mines and k stars, the probability is the product of (25−m−i)/(25−i) for i from zero to k−1. For example,22/25×21/24×20/23×19/22×18/21 ≈ 0.4957. Divide 0.97 by this probability and round down to hundredths: about 1.957x becomes 1.95x. The reverse estimate,0.97/coefficient, is approximate because of rounding.
Theoretical RTP is 97%. Rounding makes coefficient times probability slightly lower: two stars with three mines give 0.77×1.25 = 96.25%, seven stars with one mine 96.48%, and eight with ten mines about 97.00%. return to player differs from the chance of an individual win.
A three-mine round
At a one-unit stake, the first five successful picks show 1.10x,1.25x,1.44x,1.67x and 1.95x. Cash out on the fifth closes the round with 1.95. For the sixth, twenty tiles remain, seventeen safe: an eighty-five percent success chance and 2.30x, or zero on a mine. The conditional calculation 0.85×2.30 = 1.955 explains a small rounding difference without predicting the next click.
Similar coefficients require different pick counts: around 2x means thirteen stars with one mine (2.02x), five with three or three with five (1.95x). Around 5x means twenty with one (4.84x), ten with three (4.90x), or one with twenty (4.85x). Longer sequences contain more intermediate payouts available to cash out.
Theoretical maximum and Game Limits
Clearing all thirteen stars with twelve mines has a one-in-5,200,300 chance and a table coefficient of 5,044,291x; thirteen mines with twelve stars gives the same. Actual payout is restricted by the operator under Game Limits, so the table maximum is not every casino’s cash limit. Lower examples include nineteen stars with three mines at 111.55x and about 0.87%, fourteen with five at 111.54x, and seven with ten at 72.45x and about 1.34%. Catalogue stakes are 0.1–100; the mine count and cash-out point shape the spread.
Coordinates and round verification
Theoretical RTP is 97%. Provably Fair seeds place the mines before you make a single pick, so the result cannot change after you bet, and you can verify it yourself. Spribe notes that in Mines the generated result is the set of mine coordinates. Picking lucky tiles makes no difference.
The in-game explanation goes step by step. A new server seed is prepared for every round, and the settings display its SHA256 hash ahead of time. The client half is produced in your browser and may include a nonce. The two form a SHA512 hash, which becomes a number, which becomes the coordinates. After a round you can open it in your history and confirm the mines were exactly where the board showed them.
Change the client seed between rounds in Provably Fair Settings; Random on every new game supplies a new one each round. This changes verification inputs rather than increasing a star’s probability. The how RNG works discusses verifiable generation.
Auto Play and neighbouring Turbo Games
In Auto Play, mark tiles and set the round count plus balance or win stop conditions. The game opens the marked tiles and cashes out if they are all stars. A counter shows remaining rounds and allows the run to stop; an operator may disable the mode. There are no bonus rounds or special symbols.
Goal puts a separate mine in each column with constant step probability and a ceiling around 9x. Dice reduces the decision to a roll with a chosen probability. Aviator uses a shared round and chat. Other games appear on the Spribe provider page.
