Notes on this puzzle
Mine Finder #5206 hides 40 mines in a 16×16 field of 256 cells, a density of 15.6%. Some cells only give way when two neighbouring numbers are compared.
The board starts with 20 cells already uncovered, 9% of the safe ground, so the first deduction is waiting for you. Under the cover, 72 safe cells touch no mine at all, 71 show a 1 and 50 show a 2; 23 cells carry 3 or more, and the highest number in the field is 4. 9 of the mines lie along the border of the field.
Where to beginWhen two numbers share most of their neighbours, subtract one from the other.