How no-guess boards are made
The biggest frustration in classic Minesweeper is the 50/50 guess at the end. No-Flag Weekly eliminates that by verifying every board with a solver before publishing.
The solver applies basic rules, subset analysis, and boundary enumeration. Only boards that never require a guess are accepted — and easy boards are rejected too, so every weekly puzzle has at least one point where global boundary analysis is needed.
Each verified board locks its seed and starting cell. The game opens that cell automatically, so everyone starts from the same position. New boards appear every Monday at midnight KST.
Past weeks remain available in the archive so you can revisit any challenge.
Tips for finishing the weekly board
You don't have to finish the weekly board in one sitting. Your progress is saved automatically in this browser for each week, so if you close the tab and come back, your opened cells, flags and elapsed time are restored. Time spent away is not added to your record, and the timer resumes on your next input, so stepping away from a tough spot and returning with fresh eyes is a perfectly good tactic.
Even if you usually skip flags, it pays to flag every confirmed mine on the weekly board. The counter at the top simply shows 99 minus the number of flags placed, so skipped flags make the remaining-mine count wrong. Many weekly sticking points can only be broken by bringing the remaining mine count into the equation, and an accurate counter is where that calculation starts.
If you hit a mine, the result window shows what percentage of the safe cells you had opened, so you can see how much further each attempt gets within the same week. When you clear the board you can share a message with the week and your time or open a certificate card image, and for verified weeks the card states that it was a no-guess board.
Because the weekly leaderboard is about a single board, there is no difficulty selector as there is on the daily page, and every time is set on the same Expert 30×16 board. Past weeks no longer count for the leaderboard, but your best time for each week is kept in this browser, so replaying an old week gives you your own previous record to beat.