Paper Bridges: Probability, Payouts, and Demo Mechanics

Game Structure and Gross Returns

The game consists of four rows, each containing three bridges with one uniformly hidden hazard per row. You select one bridge in the active row to proceed. If you survive, you can choose to collect your winnings or continue to the next row. The gross returns for completing one to four safe rows are 1.44x, 2.16x, 3.24x, and 4.86x respectively. Row four settles automatically if you choose not to collect earlier. The expected return rate is 96 percent, calculated as (two-thirds) to the power of k multiplied by 0.96, where k is the number of safe rows.

Wallet Mechanics and Fractional Carry

Stakes are set at 10, 25, 50, or 100 coins, with 25 being the default. The entire stake is deducted once at the start of the round and persists before any animation begins. Payouts are computed in hundredths of a coin. A fractional carry is kept separately and persists even if you lose. When crediting your account, only the floor of whole coins is added, while the remainder between zero and ninety-nine stays in your fractional carry. You can manually restore your balance to one thousand coins only when idle and below ten coins. This restoration sets the balance rather than adding to it.

Settlement, Reloading, and Simulation Evidence

If you hit a hazard, you receive zero, and the round ends. Reloading the page discards any unfinished round without refund or resuming the settlement. Simulation evidence from one million rounds shows an expected RTP of 96 percent, with simulated results ranging from approximately 95.44 percent to 96.06 percent across different choices. The game uses local storage to save the whole virtual wallet, fractional hundredths, and a pending-round flag. Controls reset upon reload, and minimum stake is ten coins.

Frequently asked questions