While the demo uses virtual currency, real-money play may involve different mechanics. Malaysian players should verify how 3xx handles deposits and withdrawals, especially regarding Touch 'n Go eWallet and DuitNow, and check if the operator is licensed for operations in Malaysia.
Game Mechanics and Board Constraints
The board is a 4x4 grid. When you select a mine count, the system draws a board uniformly from the set of all boards that satisfy the "No Three Square" rule. This creates a specific, finite support of legal boards.
As you reveal safe cells, the support shrinks. The probability of the next cell being safe depends on the remaining compatible boards in this support. Cells with zero conditional safe probability are disabled. Additionally, any safe reveal that would result in a gross payout exceeding 1000 times the stake is disabled to cap the maximum win.
Scope of this virtual-coin demo
This page provides a browser demo using free virtual coins. It does not offer deposits, withdrawals, payment accounts or cash prizes. Its mathematical rules do not verify any outside operator, app, licence or payment service.
Payout Formula and Gross Multiplier
The payout is calculated using a specific gross quote formula based on the shrinking support size. The formula is:
- Gross Quote = 0.96 × Captured Stake × (Initial Support Count / Current Compatible Support Count)
The factor of 0.96 sets the exact expected gross return to 96% of the captured stake; the corresponding expected reduction is 4%. The "Captured Stake" refers to the stake amount you have committed to the round. The "Initial Support Count" is the total number of legal boards for your chosen mine count at the start. The "Current Compatible Support Count" is the number of those boards that remain consistent with the safe cells you have revealed.
Controls, Modes, and Stopping Rules
The game offers manual control over the round progression.
- Modes: Mine count choices are restricted to the exact nonempty support configurations defined in the source. There is no auto-queue mode.
- Banking: Manual banking is only available after at least one safe reveal has occurred. You can also bank when all safe cells are revealed or when no eligible cells remain.
- Stopping: A round ends immediately if you hit a mine (returning zero gross), if you manually bank, or if the system automatically banks when no eligible reveals remain.
- Cap Guard: Transitions that would exceed the 1000x stake cap are disabled before the reveal occurs.
Wallet Mechanics and Persistence
The demo uses a virtual wallet with specific persistence rules.
- Initial Balance: The wallet starts at 1000 coins.
- Refill: A manual refill is available only when idle and the balance is below 10. This action sets the integer balance to exactly 1000.
- Fractional Carry: Fractional values persist across settlement, refill, and reload.
- Unfinished Rounds: If you reload during an active round, it ends without refund or resume. Settled balances persist locally.
Mathematical Evidence and RTP
| Mines | Compatible boards | Exact Gross RTP |
|---|---|---|
| 3 | 524 | 96% |
| 4 | 1436 | 96% |
| 5 | 2508 | 96% |
Privacy and Technical Details
This demo stores settled balance and fractional carry in the browser's localStorage. This does not establish anonymity or exclude other data processing. There is no account login flow or payment flow in this demo. Virtual coins have no cash value.
Frequently asked questions
What is the "No Three Square" rule?
It is a constraint where no contiguous two-by-two square on the 4x4 board has exactly three mines. Boards are drawn uniformly from this specific set of legal configurations.
How is the payout calculated?
The gross quote is 0.96 times the captured stake, multiplied by the ratio of the initial support count to the current compatible support count. This reflects the shrinking probability space as safe cells are revealed.
What happens if I reload during a round?
The unfinished round ends without a refund or resume. Only settled balances persist locally.
