A numbered board and an arithmetic rule
The four-by-four board has labels 1 to 16 in reading order. Choose three, four or five hazards before starting. A complete hazard set is allowed only when one plus the number of positive divisors of the least common multiple of its labels is prime. The game randomly selects uniformly from the allowed complete sets: 333, 969 and 2,003 respectively.
Choose a stake, then reveal
Stakes are 10, 20, 50 or 100 play coins, with stake 20 and three hazards selected on reload. Starting captures both selections and immediately deducts the stake. During the round, stake and hazard selectors, restore and a second start are locked; sound remains available. Pick an enabled cell directly or use the button that chooses randomly among enabled cells.
Exact chances determine the return
Safe observations remove incompatible hazard sets. For each unopened label, its exact safe chance is the fraction of remaining sets in which it is not a hazard. The starting gross value is 97% of the captured stake. A successful reveal divides the current value by that exact chance; a certainly safe reveal leaves it unchanged. Displayed chances are rounded to one decimal percent, and the value readout to three decimals; those displays do not round the calculation.
Collecting and the cap
Collect becomes available after at least one safe reveal. Finding a hazard ends the round with zero return. A cell is disabled if its possible successful return would exceed 1,000 times the captured stake; equality is allowed. Automatic collection occurs only when no unopened, eligible cell with a chance strictly between zero and one remains. The cap disables a choice; it is not itself an automatic collection trigger.
Wallet and reload
The wallet balance and a separate fractional payout carry are saved in this browser’s localStorage. A new wallet starts with 1,000 play coins only when no valid saved balance exists; a saved zero remains zero. At collection, the wallet receives the whole-number part of the full gross return plus the previous fractional carry. The remainder is saved for later settlements. Gross return includes the captured stake; it is not net profit. A hazard returns zero and preserves the carry. While idle with fewer than 10 coins, Restore balance sets the wallet to exactly 1,000. It does not add 1,000 to the current balance, clear the fractional carry or resume a round. Reloading during a round preserves the stake deduction but abandons the unfinished board without refund, payout or continuation. Reloading selects stake 20 and three hazards; normal settlement keeps the selected stake and hazard count.
Expectation, privacy and audience
The mathematical gross expectation is 97% of stakes under the supported collection policies, not a promised session result or a cell’s safe probability. The page includes Google Fonts resources and a Statinside counter numbered 44. These requests are separate from the local game wallet. Their providers may handle request information under their own policies; this guide does not establish server log retention, data sale practices or anonymity. This guide and demo are intended for adults aged 18 or older.
Frequently asked questions
Can I withdraw these coins?
No. Play coins have no cash value, and this demo has no deposit, withdrawal or cash conversion flow.
Is every cell equally risky?
No. The numbered labels determine which complete hazard sets satisfy the arithmetic condition. Each displayed chance is based on the remaining compatible sets.
Will a reload restore an unfinished board?
Reloading during a round preserves the stake deduction but abandons the unfinished board without refund, payout or continuation. Reloading selects stake 20 and three hazards; normal settlement keeps the selected stake and hazard count.
