Nove Casas Nine-Cell Mines: Probability, Gross Return, and Wallet Rules

Nove Casas features nine cells where one or two mines are placed without replacement. Players select a stake of 10, 25, 50, or 100 and choose between one or two mines. The goal is to reveal safe cells to increase the gross multiplier. The chance of reaching a chosen safe-cell count is the number of all-safe combinations divided by the number of all possible combinations of that size. A mine ends the round with zero return, while revealing the third safe cell triggers automatic settlement.

Gross return includes the initial stake and equals the stake multiplied by 0.95 divided by the probability of surviving the selected depth. Every collection depth has an exact expected gross RTP of 95 percent. Fractional returns carry forward separately in localStorage, while whole coins are credited by flooring the total. If a mine is hit, the round ends with zero return, but prior fractional carry is preserved.

Starting a round deducts the chosen whole stake immediately. Manual restore to 1000 coins is available only when idle and the balance is below ten. Reloading the page abandons unfinished rounds without refund or resume, though deducted balance and fractional carry are retained. Controls for stake and mine count are disabled during a round, and collect is enabled only after a safe reveal.