Board Setup and Support
The game uses a 4x4 grid. The board layout is not random across all possibilities; it is drawn uniformly from a specific "legal board support" defined by the selected mine count and the anti-diagonal alternation rule.
Each safe reveal filters this support. The probability of the next cell being safe depends on the remaining compatible support size.
Payout Calculation and RTP
The gross quote is calculated using the following formula:
Gross Quote = 0.96 × Captured Stake × (Initial Support Size / Current Compatible Support Size)
The exact gross RTP is 0.96 (96%). Simulation measurements provide supporting sample observations, with measured RTPs hovering around 96.0% across various modes and mine counts.
Controls and Modes
- Board Size: 4x4 grid.
- Mine Count: Choices are limited to the exact nonempty support configurations defined in the source.
- Banking: Manual bank is available only after at least one safe reveal.
- Auto Queue: No auto queue; manual idle-only refill is the only restoration method.
Stopping Rules and Caps
The round ends if:
- A mine is revealed (gross return is zero).
- The player manually banks.
- All safe cells are revealed.
- No eligible cell remains (automatic banking).
Cells with zero conditional safe probability are disabled. Cells whose safe quote would exceed 1000 times the stake are also disabled. The cap guard disables individual above-1000x transitions before a reveal.
Wallet and Persistence
The demo wallet starts at 1000 virtual coins. A manual idle-only refill sets the balance to exactly 1000 if the balance is below 10, preserving fractional carry. Fractional carry persists across settlement, refill, and reload.
Settled balance persists locally, including zero. Unfinished rounds end without refund or resume upon reload. No account login or payment flow exists in this demo.
Mathematical Evidence
| Mines | Policy | Exact Gross RTP | Measured RTP |
|---|---|---|---|
| 3 | 0 | 0.96 | 96.065 |
| 4 | 5 | 0.96 | 96.535 |
| 5 | 5 | 0.96 | 96.626 |
The exact gross RTP is consistently 0.96 across all modes.
Frequently asked questions
How is the board generated?
The board is drawn uniformly from all legal boards with the selected mine count satisfying the anti-diagonal occupancy alternation rule. It is not drawn from all unconstrained boards.
What happens if I reload the page?
Settled balance persists locally. However, an unfinished round ends without refund or resume. Fractional carry is preserved.
Is there a maximum payout cap?
Yes. Any safe reveal that would exceed the public 1000-times-stake cap is disabled. The current quote is automatically banked when no eligible reveal remains.
