The name and scope of the guide
38D is the name addressed by this independent guide on 38d.info. The guide describes its own original Next Prime Gap Roulette demo. No reviewed primary-source operator, licence, official app or account-service identity is established here. A similarly named website or search listing does not establish that affiliation.
An original prime-gap mechanic
Each round draws two independent readings a and b, each uniformly chosen from 0 to 12. Set n = a + b + 1. Find the smallest prime p greater than or equal to n, then score p − n. If n is already prime, the score is zero: the calculation does not skip to the next strictly larger prime.
Tickets with different coverage
Choose a ticket before drawing: Lower accepts scores 0 and 1, Middle accepts 2 and 3, and Upper accepts 4 and 5. There are 169 equally likely ordered pairs of readings. Lower matches 115 pairs, Middle 51 and Upper 3. Each count divided by 169 is that ticket’s hit probability, not the probability that a session will be profitable. A matching score returns the captured stake multiplied by 0.96 × 169 ÷ the selected band’s coverage. The gross multipliers are approximately 1.410783 for Lower, 3.181176 for Middle and 54.08 for Upper. A miss returns zero. Each band’s exact expected gross return is 96%; a single round or session can differ from that average.
What the controls do
Select a stake of 10, 20, 50 or 100 virtual coins. The default is 20 with the Lower ticket selected. Starting deducts one stake for both readings. Stake and ticket choices, restoration and another start are locked during the round; the sound control remains available. There are no extra bets, interim collection or automatic repeat rounds. The readings appear in sequence, not as two separate bets. Normally each reveal waits about 420 milliseconds. With reduced motion, each reading is revealed on its next animation frame. The second reveal completes the score and settles the captured stake. Revealing the first reading does not unlock settings or provide a collection opportunity.
What the local wallet preserves
The local wallet starts with 1,000 virtual coins. Balance and fractional payout carry are saved in browser local storage, including a zero balance. While idle, a balance below 10 makes manual restoration available. Restoration sets the balance to exactly 1,000 and preserves the carry; it does not add 1,000, credit the carry immediately or run automatically. Reloading before settlement ends the unfinished round without refund, payout or resumption. Its captured stake stays deducted. Previously saved balance and carry remain, while stake selection returns to 20 and the Lower ticket is selected again. Unfinished readings and chosen settings are not saved for continuation.
Requests and limits
The game stores the virtual-coin balance and fractional payout carry locally. The page also loads Manrope and Lora through Google Fonts and includes Statinside counter 44. These external requests are separate from the local wallet. Having no login or cashier does not establish anonymity or the absence of personal-data processing. The guide and demo are intended for adults aged 18 or over. This audience statement is not an implemented age check or a determination of local legality. Choose your own time and virtual-coin limit, take breaks and stop if you want to end the session. The interface does not enforce those personal limits.
Frequently asked questions
Is this an official 38D operator website?
This guide does not establish that identity or affiliation. It describes its own original demo; outside operator, licensing and app claims remain unverified.
Does the demo reproduce an outside game?
No identified outside product is reproduced or certified by this guide. The rules describe the original demo provided here.
How do I restore the balance?
While no round is active and the balance is below 10, use Restore balance. It sets the balance to 1,000 and preserves the fractional carry without immediately crediting it.
