About This OK12 Guide

A game about important links

Bridge Inspector draws an undirected graph on five vertices, labelled 1 to 5. Ten independent fair switches choose the ten possible links, one for each pair of vertices. Each link is equally likely to be present or absent, so all 1,024 graphs are equally likely. A bridge is a present link whose removal increases the number of separate connected components. Isolated vertices count as components too.

The diagram lets you inspect the bridges after a draw: amber links are bridges, other solid links are present and dashed links are absent.

Scope and external identity

This independent OK12 guide explains its own free browser demo. No outside operator, business ownership, licence, official account address, payment service or app has been established here. A matching name or search result does not verify an outside service or connect it to this demo.

How the three Powers pay

The score is the number of bridges, from 0 to 4. Power 1 uses that count, Power 2 its square, and Power 3 its cube. The gross multiplier is 0.96 × that powered score divided by its own average over all 1,024 graphs. All Powers draw from the same graphs with the same probabilities; the selected Power changes the payout mapping, not the chance of a particular graph. No bridges means zero return in every Power.

Each Power has exactly 96% expected gross return before whole-coin wallet credits and carry. That average follows from applying the 0.96 factor to a powered score normalized by its own mean. It is not a promised return for a round or session. A gross return includes what is paid back from the stake, rather than being additional profit. Integer credits and carry mean that an individual wallet credit need not equal 96% of its stake.

One captured stake and a local wallet

Choose a stake of 10, 20, 50 or 100 and a reward Power of 1, 2 or 3 before pressing Draw link switches. A fresh page selects stake 20 and Power 1, with sound off. The chosen stake is deducted once at the start, and both stake and Power are fixed for that draw. Stake, Power, draw and restoration controls are locked until settlement; sound remains available. There is no early collection or automatic queue.

A new wallet starts at 1,000 free virtual coins. Settlement multiplies the captured stake by the full multiplier and adds the saved fractional remainder. Only the whole-number part is credited to the wallet; the new remainder is saved for a later settlement and is never credited separately. The multiplier shown on screen is rounded to four decimal places, but the calculation uses the full value. A zero return credits no coins and retains the existing remainder.

The wallet is saved when the stake is deducted and again when the result is credited. Reloading during an unfinished draw loses that draw without refund or resume, so its already deducted stake stays deducted. The saved wallet, including zero, and fractional remainder remain if browser storage is retained. Reload returns stake to 20, Power to 1 and sound to off; the result meters show a dash.

Restoration and browser requests

Restore balance is available only when no draw is active and the balance is below 10. Pressing it sets the wallet to exactly 1,000; it does not add 1,000 or run automatically. The fractional remainder is preserved. A balance of exactly 10 is not eligible.

The browser stores the virtual wallet and a separate fractional remainder in localStorage for this site. The page also requests Google Fonts resources and loads the Statinside measurement script for counter ID 44, with a measurement image when JavaScript is disabled. These identified requests are not a complete network audit. Local storage and the lack of a login do not establish anonymity or promise that no personal data are processed.

Adult audience and practical breaks

The guide is intended for adults aged 18 and over. That label does not enforce an age check or establish local legality. Virtual coins have no cash value, cannot be withdrawn and are not prizes.

There is no automatic draw queue, enforced session timer or account-level self-exclusion system. Choose your own limits and take breaks between settled draws. If play is hard to control, consider appropriate local qualified help.

Frequently asked questions