Independent guide · original demo · 18+

Exact Rules of the Ferry Locks Demo

The official website of ou777.

The official website of ou777. Ferry Locks is a demo game where you select an exit lock to survive a series of chance-based challenges. This guide details the exact probabilities, payout structures, and wallet mechanics based on observed evidence from the original demo.

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Game Mechanics and Survival Probabilities

Before starting, choose one of four exit locks (1–4). Each lock has a specific survival path with independent chances at successive stages: 80%, 75%, two-thirds, and 50%. Reaching your chosen exit yields a gross return of 1.2x, 1.6x, 2.4x, or 4.8x depending on the lock selected. Failure results in a zero return. You cannot exit manually during the round; settlement is automatic upon reaching the end or failing a stage.

Wallet, Stakes, and Settlement

Stakes are set to 10, 25, 50, or 100 virtual coins, with 25 as the default. The stake is deducted once at the start and persists before animation. Payouts are calculated in hundredths; fractional carry is saved separately, and only floor whole coins are credited. If the balance drops below 10 while idle, you may manually refill to restore the balance to 1000. Reloading the page discards any unfinished round without refund or resumption.

Mathematical Evidence and Controls

Simulation data over one million rounds shows an expected Return to Player (RTP) of 96% across all modes, with simulated results ranging from 95.96% to 96.08%. The score function for survival at exits is 0.8, 0.6, 0.4, and 0.2, multiplied by gross returns of 1.2, 1.6, 2.4, and 4.8 respectively. Controls for stake, start, and mode selection are disabled while the round is active. The exit choice resets to 1 upon reload.

Frequently asked questions

How is the payout calculated in Ferry Locks?

Payouts are calculated in hundredths. The gross return includes the stake, and any fractional carry is saved separately. Only floor whole coins are credited to your balance, with the remainder kept as fractional carry.

What happens if I reload the page during a round?

Reloading discards any unfinished round immediately. The deducted stake is not refunded, and the round is not resumed upon return. You must start a new round with a fresh stake deduction.