Notes on this puzzle
Mine Finder #5312 hides 99 mines in a 30×16 field of 480 cells, a density of 20.6%. Every safe cell here can be decided by looking at one number at a time.
The board starts with 107 cells already uncovered, 28% of the safe ground, so the first deduction is waiting for you. Under the cover, 110 safe cells touch no mine at all, 98 show a 1 and 105 show a 2; 68 cells carry 3 or more, and the highest number in the field is 5. 29 of the mines lie along the border of the field. Corners hold 3 of them; a corner cell has only three neighbours.
Where to beginKeep an eye on the mine counter; on this field the final pocket is often settled by the total.