Notes on this puzzle
99 mines, 381 safe cells and one 30×16 field: that is Mine Finder #5301. Near the end you may need the total number of mines to decide the last cells.
The board starts with 36 cells already uncovered, 9% of the safe ground, so the first deduction is waiting for you. Under the cover, 49 safe cells touch no mine at all, 140 show a 1 and 111 show a 2; 81 cells carry 3 or more, and the highest number in the field is 5. 10 of the mines lie along the border of the field. Corners hold 1 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.