Uniform layouts and the 2×2 rule
Choose 3, 4 or 5 hazards on a 4×4 grid. Every contiguous 2×2 square contains at most two hazards. All layouts satisfying that rule have equal probability; one randomly chosen layout stays fixed throughout the round. Horizontal and vertical position can affect cell odds.
Counting compatible layouts
Count compatible legal layouts after each reveal. For a selected cell, its safe probability is the number of those layouts in which it is safe divided by the total compatible count. The unconstrained formula remaining safe cells divided by remaining cells is not valid here. Probabilities can rise or fall as observations change the compatible set.
Expected return and variance
Exact expected return is97% for permitted stopping policies. The initial3% reduction is applied once; conditional safe-branch compensation preserves expectation. Choosing coordinates or stopping changes risk and variance, not this expectation. A short session is not guaranteed to match it.
Collecting and eligibility limits
Collect is available after a safe reveal. Proven hazards are unavailable; proven-safe cells have probability1 and add no value. A choice with next value above1000 times stake is unavailable. When no eligible uncertain choice remains, the current value is banked automatically. The guard is not a promise that1000×stake can be reached.
Wallet persistence and refill
Settled balance and fractional payout carry persist in localStorage. Reloading during a round ends it without refunding its already deducted stake. Outside a round, refill restores1000 coins when balance is below the smallest stake; it does not add1000 or reset fractional carry. Hazard count, stake and refill are locked during play.
Session limits
This demo is restricted to adults18+ and uses coins without cash value or prizes. Set session time and virtual-coin limits before playing, then stop at those limits. Raising a stake to recover losses does not improve expectation. If playing affects responsibilities or becomes hard to control, stop and seek suitable independently verified local support.
Frequently asked questions
Is this an operator website?
This independent 2028 Euro guide supplies its own free Vent Squares Mines demo. Operator identity, domains, licence, apps, payments, support and commercial game equivalence have not been independently verified. No operator account or commercial link is supplied here.
What is the 2×2 layout rule?
Choose 3, 4 or 5 hazards on a 4×4 grid. Every contiguous 2×2 square contains at most two hazards. All layouts satisfying that rule have equal probability; one randomly chosen layout stays fixed throughout the round. Horizontal and vertical position can affect cell odds.
How is the live value calculated?
Live value starts at0.97 times the virtual stake. A safe reveal divides it by that cell’s exact conditional safe probability among the remaining compatible legal layouts. A hazard ends the round with zero return. Reveals change knowledge, not the hidden layout.
How are safe probabilities counted?
Count compatible legal layouts after each reveal. For a selected cell, its safe probability is the number of those layouts in which it is safe divided by the total compatible count. The unconstrained formula remaining safe cells divided by remaining cells is not valid here. Probabilities can rise or fall as observations change the compatible set.
Explore the free Vent Squares game and its exact conditional cell odds.
