Independent query guide · virtual-coin demo

Responsible Gaming and Demo Mechanics

The official website of 39h.

The official website of 39h. This independent guide is intended for adults aged 18 or over. Its original demo uses virtual coins with no cash value. Breaks and limits are personal choices; the interface does not enforce them.

Play the free demo

Personal Choices and Interface Limits

The 18+ label is this guide’s audience policy, not an implemented age gate or a statement of local legality. You may choose breaks or personal limits outside the interface. The demo has no pause button, enforced timer, coin-limit setting or self-exclusion control. Its payout cap and refill do not guarantee safe behaviour. Closing the page ends your interaction; reloading an active round leaves its stake deducted without refund or resume. Clearing local data is not self-exclusion.

Wallet Mechanics and Restoration

The initial integer wallet is 1,000 virtual coins. Manual refill is available only while idle with integer balance below 10. It sets that integer balance to 1,000 and preserves fractional carry. Settlement credits the whole-number portion of gross return plus carry and saves the remainder. Balance and carry persist locally, including zero balance. Reloading an unfinished round keeps the captured stake deducted without refund or resume. These mechanical rules are not spending limits or self-exclusion.

Data Storage and Privacy

The wallet balance and fractional carry use browser localStorage. This does not guarantee anonymity or describe all processing. Google Fonts is declared in the template, and the production builder declares Statinside visitor analytics counter 44. Actual browser capture is pending; neither declaration establishes retention or the contents of every request. Clearing cached files alone need not delete localStorage. Remove this site’s stored data through your browser settings if you want to clear it.

Game Mechanics Overview

Choose 3, 4 or 5 mines on a 4×4 board. Empty rows are allowed and may repeat. Only the nonzero four-bit row patterns must be distinct. The legal-board counts are 400, 1,264 and 2,928 respectively. Cryptographic 32-bit rejection sampling gives every board in the selected set equal probability. Safe reveals narrow the compatible boards.

Gross quote = 0.96 × captured stake × initial legal-board count ÷ current compatible-board count. Gross includes the returned stake and is not net profit. Exact expected gross RTP is 96%, not a guaranteed session result. The saved first-cell 3-mine sample measured 95.94% over 1,000,000 rounds; measured percentages are observations, not the exact law.

A mine returns zero gross. Manual banking is available after the first safe reveal. Certain mines and transitions whose safe return would exceed 1,000 times the stake are disabled before reveal. Revealing all safe cells or having no eligible reveal remaining banks the quote automatically.

Expected Returns and Evidence

Gross quote = 0.96 × captured stake × initial legal-board count ÷ current compatible-board count. Gross includes the returned stake and is not net profit. Exact expected gross RTP is 96%, not a guaranteed session result. The saved first-cell 3-mine sample measured 95.94% over 1,000,000 rounds; measured percentages are observations, not the exact law.

Identity and Scope

This original demo does not certify or reproduce an outside product. An outside operator, licence, catalogue or official app has not been verified here. Virtual coins cannot be withdrawn or exchanged for cash.

Frequently asked questions

Is the demo's wallet restored automatically?

No. Restoration is manual and idle-only. It sets the balance to exactly 1000 when below 10 coins.

Does the demo track my personal data?

Wallet balance and fractional carry use browser localStorage. Google Fonts and Statinside visitor analytics are declared. No account login is required, but this does not establish anonymity or exclude other processing.

What happens if I reload during a round?

The round ends without refund or resume. The settled balance persists locally.