Fixed board layout
The board has 16 cells, numbered left to right across four rows. Choose 3, 4 or 5 hazards before starting. The game samples one complete layout uniformly from 68, 72 or 24 permitted layouts, respectively. That layout stays fixed throughout the round.
Safe cells connect through horizontal or vertical neighbours. They must remain connected even if any single safe cell is removed. This constraint changes the chances from those of an ordinary board with independently placed hazards.
Cell percentages
Each cell displays its conditional chance of being safe among layouts compatible with the revealed safe cells. Percentages are rounded to one decimal for display; the calculation uses the full ratio. Already revealed cells, proven safe cells and proven hazards are disabled.
The gross multiplier is 0.97 × original layout count ÷ remaining layout count. It starts at 0.9700×. A safe pick divides the previous multiplier by that cell’s safe chance. A hazard ends the round with zero returned coins.
When collection is available
After at least one uncertain safe pick, Collect returns the current gross value. A safe pick that leaves no uncertain cells triggers automatic collection. Stake and hazard settings, restoration and a second start are locked during play; sound remains available.
Settlement credits the whole-number part of stake × multiplier + saved fractional carry and saves the remainder for later rounds. The multiplier includes the stake; it is not a profit multiplier. A losing round returns zero and preserves the saved fraction.
Stakes and restoration
A fresh wallet starts with 1,000 virtual coins. Available stakes are 10, 20, 50 and 100; the default is 20. Start deducts the chosen stake once and immediately saves the new balance. There is no deposit or withdrawal, and these coins have no cash value.
When idle with fewer than 10 coins, Restore sets the balance to exactly 1,000. It neither adds 1,000 nor runs automatically. It preserves the selected stake, hazard count and saved fraction.
Unfinished round
Reloading an unfinished round keeps the stake deduction, current balance and fractional carry. The hidden board is discarded without refund, payout or resume. New controls start at stake 20 and 3 hazards.
Balance and fractional carry use this browser’s localStorage. Closing a tab does not create an account or save an unfinished board. Removing site storage deletes these local values; clearing cached files alone may leave them intact.
Expected return and limit
The mathematical expected gross return is 97% in the uniform-layout model for strategies using the revealed information and eventually collecting or losing. This is not a 97% chance of winning or a promised result for a session. Abandoning an unfinished round forfeits its possible return.
Nine saved simulations used 1,000,000 rounds each, covering three hazard counts and collection depths one, two and three. Observed gross returns ranged from 96.668% to 97.142%, rounded to three decimals here. Those observations support the model; they do not replace its exact expectation. Whole-coin credits can differ from gross values because the remainder is carried forward.
The code includes a guard against a prospective multiplier above 1,000×. However, these supported layouts can reach at most 65.96×, 69.84× and 23.28× for 3, 4 and 5 hazards. The guard is therefore unreachable in this demo and does not set an attainable target or protect a stake from loss.
Frequently asked questions
Does the layout change after a pick?
No. One permitted layout is sampled at Start and stays fixed for that round.
What does a cell percentage mean?
It is the chance of safety among layouts compatible with revealed safe cells, rounded to one decimal on screen. It is not a chance of winning the entire round.
Can a proven safe cell be selected?
No. Proven safe cells, proven hazards and already revealed cells are disabled.
When can I collect?
After at least one uncertain pick reveals a safe cell. If no uncertain cell remains after a safe pick, collection is automatic.
What happens after a hazard?
The round ends with zero returned coins. The stake was already deducted at Start; saved fractional carry is preserved.
Which stakes and hazard counts are available?
Stakes 10,20,50,100 and hazards 3,4,5. Defaults are stake 20 and 3 hazards. Both settings lock during a round.
How is the multiplier calculated?
It is 0.97 times the original number of layouts divided by the number still compatible with revealed safe cells. It includes the original stake, rather than showing profit alone.
Can the 1,000 × guard be reached?
No. Supported layouts reach at most 69.84 × across the three modes. The code contains the guard, but it is unreachable here.
How does restoration work?
When idle with fewer than 10 coins, Restore sets the balance to exactly 1,000. It is manual, preserves selected controls and carry, and does not add 1,000.
What does an unfinished reload preserve?
It preserves the deducted stake through the saved balance and retains carry. It discards the board without refund, payout or resume; controls reset to stake 20 and 3 hazards.
Is 97% a guaranteed return?
No. It is the expected gross return under the uniform-layout model, not a win probability or promised session result. An abandoned round forfeits its possible return.
Is this an official 7JJ app or account service?
No official status or outside service has been verified here. This independent guide offers its own browser demo without sign-in, deposits or withdrawals.
