The core mechanic relies on a prefix support rule: for each length one through four, the number of mines in the top rows must be at least the number of mines in the left columns. Draws are uniform over this support, not over all unconstrained boards.
Board Support and Uniform Draws
A four-by-four board is drawn uniformly from all boards satisfying the exact public support rule. The chosen mine count and this constraint define an exact finite board support. Each safe reveal filters this support, reducing the pool of compatible boards.
Score Function and Gross Payout
The score function uses the initial support size and the current compatible support size after safe reveals.
- Gross Quote Formula: 0.96 × captured stake × initial support count / current compatible support count.
- Mine Reveal: Returns zero gross.
- Disabled Cells: Cells with zero conditional safe probability are disabled. Cells whose safe quote would exceed 1000 times the stake are also disabled.
Controls, Modes, and Stopping Rules
The game offers specific controls and modes:
- Board: Four-by-four grid.
- Mine Counts: Choices are limited to the exact nonempty support configurations in the source.
- Captured Stake: Locked throughout the round; does not change.
- Banking: Manual bank becomes available only after at least one safe reveal. No auto queue exists.
- Auto-Bank: When no eligible cell remains, the current quote is banked automatically.
- Cap Guard: Individual transitions above 1000x are disabled before a reveal.
Mathematical Evidence and RTP
Simulation measurements are supporting sample observations, not the mathematical payout law. The exact gross RTP is 0.96 across all modes.
| Mines | Policy | Exact RTP | Measured RTP | Gross Multiplier |
|---|---|---|---|---|
| 3 | 0 | 0.96 | 96.0246 | 1.2 |
| 3 | 5 | 0.96 | 96.1775 | 244.8 |
| 4 | 0 | 0.96 | 95.9195 | 1.2931 |
| 4 | 5 | 0.96 | 95.8621 | 760.32 |
| 5 | 0 | 0.96 | 96.0062 | 1.408 |
| 5 | 5 | 0.96 | 95.6972 | 887.04 |
Different modes have different distributions; expected RTP is not a promised session result.
Wallet and Persistence
The wallet starts with 1000 virtual coins. Available stakes are 10, 20, 50, 100 and 200; the selected stake is debited and saved when a round starts. Stake and mine count stay fixed during that round.
At settlement, the game credits floor(gross return + previously saved fractional carry), then saves the remaining fraction. A mine returns zero. The carry survives settlement, refill and reload.
When idle with fewer than 10 coins, manual refill sets the integer balance to exactly 1000; it does not add 1000. Reloading abandons an unfinished round without refund or resume. The saved balance includes its already-debited stake. Clearing cached files alone may leave localStorage intact.
Privacy and Identity
Observed storage uses browser localStorage for current demo balance and fractional carry. This does not establish anonymity or exclude other processing. The template declares a Google Fonts stylesheet. Actual browser request capture is pending; this is not a claim that other requests or processing are absent. The HTML also declares a Statinside script and a Statinside pixel for browsers without JavaScript; actual requests depend on the browser.
The 18+ label is this guide's own intended audience policy, not a claim about local law or an implemented age gate. No account or payment controls are present in the demo.
Frequently asked questions
How is the board support calculated?
The board support is defined by the rule: for each prefix length one through four, mines in that many top rows are at least mines in that many left columns. Draws are uniform over this support, not over all unconstrained boards.
What happens when no eligible cell remains?
When no eligible cell remains, the current quote is banked automatically. The cap guard disables individual transitions above 1000x before a reveal.
Does the wallet refill automatically?
No. Refill is manual and idle-only. It sets the integer wallet to exactly 1000 when the balance is below 10 and preserves fractional carry.
