The game uses a 4×4 board with a specific mathematical constraint: no contiguous 2×2 square may have exactly three mines. Draws are uniform over this constrained support, not over all possible boards. This guide explains the exact mechanics, wallet behavior, and math evidence observed in the demo.
Game Mechanics & Rules
No Three Square is played on a four-by-four board. The mine count is selected from exact nonempty support configurations defined by the rule: no 2×2 square contains exactly three mines. Boards are drawn uniformly from this support set.
After each safe reveal, the gross cashout quote is calculated as:
- Gross Quote = 0.96 × captured stake × (initial support size / current compatible support size)
Captured stake and the chosen mine count remain locked throughout the round. Known-certain mines are disabled. Cells with zero conditional safe probability are disabled. Cells whose safe quote would exceed 1000× stake are also disabled.
The round ends via:
- A mine reveal (returns zero gross).
- Manual bank (available after at least one safe reveal).
- No eligible cells remaining (current quote is automatically banked).
Wallet & Persistence
The demo wallet has an initial balance of 1000 virtual coins. Fractional carry persists across settlement, refill, and reload.
Manual Refill: When idle and the balance is below 10, clicking refill sets the balance to exactly 1000. This is a manual set, not an automatic replenishment or addition of coins.
Persistence: The settled balance persists locally in the browser. If an unfinished round ends on reload, there is no refund or resume of the round state.
Math Evidence & RTP
The exact gross RTP is 0.96 across all modes. Simulation measurements are supporting observations and do not guarantee session results.
| Mines | Policy | Exact Gross RTP | Measured RTP | Gross Multiplier |
|---|---|---|---|---|
| 3 | 0 | 0.96 | 95.9676 | 1.1920 |
| 3 | 1 | 0.96 | 95.9644 | 1.9274 |
| 3 | 2 | 0.96 | 95.9300 | 1.5016 |
| 3 | 3 | 0.96 | 96.0518 | 2.3289 |
| 3 | 4 | 0.96 | 95.9485 | 3.4692 |
| 3 | 5 | 0.96 | 95.8171 | 503.0400 |
| 4 | 0 | 0.96 | 95.9709 | 1.3192 |
| 4 | 1 | 0.96 | 96.1284 | 2.6562 |
| 4 | 2 | 0.96 | 96.0673 | 1.8479 |
| 4 | 3 | 0.96 | 95.8889 | 3.0034 |
| 4 | 4 | 0.96 | 95.9981 | 6.5335 |
| 4 | 5 | 0.96 | 95.3941 | 275.7120 |
| 5 | 0 | 0.96 | 96.1422 | 1.4982 |
| 5 | 1 | 0.96 | 95.9293 | 3.9406 |
| 5 | 2 | 0.96 | 96.1704 | 2.4005 |
| 5 | 3 | 0.96 | 96.0393 | 3.7156 |
| 5 | 4 | 0.96 | 96.4149 | 14.9545 |
| 5 | 5 | 0.96 | 95.5991 | 802.5600 |
Controls & Modes
- Board: Four-by-four grid.
- Mine Count: Choices are only the exact nonempty support configurations in the source.
- Bank: Manual bank becomes available only after at least one safe reveal.
- Refill: No auto queue; manual idle-only refill.
- Sound: Remains available during play.
Captured stake and mine count are locked throughout the round. Stake, mine count, and refill are locked while the round is active. Eligible reveal cells and bank remain available during active rounds.
Privacy & Storage
The demo uses browser localStorage for settled 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.
The absence of account or payment controls in the demo does not prove that no personal data are processed. Clearing cached files may leave local storage where that storage is actually used.
Responsible Use & Audience
The intended audience for this guide is 18+. This is a guide policy, not a claim about local law or an implemented age gate.
Responsible use includes optional pauses, setting personal time/virtual-coin limits, and finding appropriate local qualified help. The demo does not clinically train behavior or make losses safe. There are no account-level blocking, timer, or self-exclusion tools in this demo.
Frequently asked questions
Is this the official 3xx casino site?
No. This is an independent guide's demo. It does not certify or reproduce any outside product, nor does it link to an official operator, cashier, or licensed platform. The query name '3xx' is used here to identify the specific game mechanics and demo structure.
How does the wallet refill work?
When idle and the balance is below 10, a manual refill sets the balance to exactly 1000. This is a set operation, not an addition. Fractional carry persists across this refill and settlement.
What happens if I reload during a round?
An unfinished round ends without refund or resume. The settled balance persists, but the current round state is lost. Refill is available again once idle.
