Equal Positive Counts on Both Diagonals
Diagonal Twin Mines has four rows and four columns. Select two, four or six TOTAL hazards before starting. The main diagonal from top left to bottom right and opposite diagonal from top right to bottom left must contain the same POSITIVE number of hazards. Zero on both diagonals is not legal. The other eight cells are unrestricted subject to the total count. There are respectively 16, 484 and 2144 legal full layouts. One is selected uniformly and stays fixed during its round. Cells can have different posterior safety probabilities.
The initial gross collection value is 0.97 times the captured stake. For each unopened cell, count the remaining legal layouts compatible with all safe reveals. Its displayed safe probability is the proportion without a hazard in that cell. A safe reveal divides the current collection value by this exact probability. A hazard ends the round with zero return. The displayed percentage is rounded for reading; the payout uses the exact fraction. A proven safe cell has probability one and adds no multiplier. A proven hazard has probability zero and cannot be selected. A choice that would make the collection value exceed 1000 times the captured stake is disabled individually. Other eligible choices remain available. The game collects automatically when no eligible uncertain choice remains. Otherwise, collect after at least one safe reveal or choose another enabled cell. Every permitted stopping policy has exact unrounded expected gross credit of 97% of captured stake. This is not winning frequency or a guaranteed individual or session outcome. Conditional information changes available choices and quotes without raising expected return. The 0.97 factor is included once; settlement does not deduct another three percent.
Current Value and Conditional Probability
The initial gross collection value is 0.97 times the captured stake. For each unopened cell, count the remaining legal layouts compatible with all safe reveals. Its displayed safe probability is the proportion without a hazard in that cell. A safe reveal divides the current collection value by this exact probability. A hazard ends the round with zero return. The displayed percentage is rounded for reading; the payout uses the exact fraction.
Collection and Disabled Choices
A proven safe cell has probability one and adds no multiplier. A proven hazard has probability zero and cannot be selected. A choice that would make the collection value exceed 1000 times the captured stake is disabled individually. Other eligible choices remain available. The game collects automatically when no eligible uncertain choice remains. Otherwise, collect after at least one safe reveal or choose another enabled cell.
Expected Gross Credit
Every permitted stopping policy has exact unrounded expected gross credit of 97% of captured stake. This is not winning frequency or a guaranteed individual or session outcome. Conditional information changes available choices and quotes without raising expected return. The 0.97 factor is included once; settlement does not deduct another three percent.
Frequently asked questions
Is an operator verified?
77C is a search label, not an operator identity established by this guide. 77c.info is an independent information guide with its own Diagonal Twin Mines demo. No company, licence, official account domain, commercial game catalogue, payment service, app publisher or support contact is verified here. Search position, a similar name and page appearance cannot establish those facts.
What makes a layout legal?
Diagonal Twin Mines has four rows and four columns. Select two, four or six TOTAL hazards before starting. The main diagonal from top left to bottom right and opposite diagonal from top right to bottom left must contain the same POSITIVE number of hazards. Zero on both diagonals is not legal. The other eight cells are unrestricted subject to the total count. There are respectively 16, 484 and 2144 legal full layouts. One is selected uniformly and stays fixed during its round. Cells can have different posterior safety probabilities.
How does collection value change?
The initial gross collection value is 0.97 times the captured stake. For each unopened cell, count the remaining legal layouts compatible with all safe reveals. Its displayed safe probability is the proportion without a hazard in that cell. A safe reveal divides the current collection value by this exact probability. A hazard ends the round with zero return. The displayed percentage is rounded for reading; the payout uses the exact fraction.
Read the original demo rules and virtual-wallet boundaries.
