I've done MinesWeeper Challenge on here from FaceBook. Some take many more tries than other, N° 20 over 1 week. But then found that that 1= the last, there = no more :(
Tips: if it = like a sandwich, line of unknown, N°s & unknown again; then if 1 N° = 2 less than 1 next to it, then the N° next = free above & below (or either side if up-down). You know if the N°s go 32 then no bomb after 2, & if 21 then no bomb after 1, so if both above & bolow + them 1 gets: 53, likewise 42, 64 & 31.
N° 9 took me many tries, now got to N° 13 (unluky for some), after quite a few tries I got it done, but showing as -1 bombs so it won't let me have it as finished. Some more tries & got it & now on N° 20, come down to guessing last 6 or so with 50% chance each.