Semibola: Interval Relation Game Rules & Demo

The core mechanic draws four independent uniform readings from thirteen pockets (0–12). These are split into two pairs:

• Interval A: The first two readings, sorted into a closed interval.
• Interval B: The last two readings, sorted into a closed interval.

Scoring follows a strict priority order:

1. Equal (Score 4): Intervals are identical.
2. Disjoint (Score 0): Strictly separate intervals.
3. Containment (Score 2): One interval is inside the other without equality.
4. Shared Endpoint (Score 1): Intervals share an endpoint but have zero-length intersection otherwise.
5. Partial Overlap (Score 3): Otherwise.

A singleton interval inside another is classified as containment. Tickets (Lower, Upper, Even) are selected before spinning. One stake covers all four independent readings.

For a selected ticket, the gross payout is:

• Miss: 0
• Win: 0.96 × captured whole stake × total support / number of winning ordered outcomes

Different tickets can overlap. The exact winning counts and support values are recorded in the math modes. Settlement takes 480ms. Stake, ticket, and refill options are locked during active settlement and any auto queue.

Measured RTP values are sample observations, not promised returns. The exact gross RTP for all tickets is 0.96.

The demo wallet starts with 1000 virtual coins. Fractional carry persists across settlement, refill, and reload. If the balance is below 10 and the user is idle, a manual refill sets the balance to exactly 1000, preserving fractional carry. Settled balances persist locally, including zero. Unfinished draws are discarded on reload without refund or resume. Controls are locked while active.

The query identity is unverified. The demo uses localStorage for balance and fractional carry, but this does not prove anonymity or exclude other processing. A Google Fonts stylesheet is declared in the template, but actual request capture is pending. There is no account login or payment flow. The 18+ label is this guide's audience policy, not a legal age gate.

Auto mode schedules at most ten draws. The Stop button cancels future draws, but active draws finish. Sound remains available throughout. There is no early bank option. Stake, ticket, and refill remain locked through settlement and the auto queue.