| Into each square of a 5x5 grid, place the digits from 0 to 8 once each. In the unoccupied squares place mines as needed so that, as in classic minesweeper, each digit represents the number of mines neighboring that square. Try to use the minimum number of mines necessary to achieve this. |
Source: Original.
With the sorting/elimination as before (0 in the upper left corner..) we get 42 boards with 15 mines and 2 boards with 16 mines, listed below. This is more than derived from elimination of my first e-mail, because this contained some, but not all swapped/rotated solutions. The integer number quoted after the "xx mines:" is obtained from a binary representation of the mine locations (M=1, empty_or_number=0), where the upper left corner is the least-significant digit and the lower right corner the most-significant digit. If the final number in such a line "xx mines: YYYYY" is "1", the same mine configuration allows another placement of the numbers (which is not necessarily listed because it is equivalent up to a rotation/mirror operation to another one). Example: mine configuration 15924764 or 8060444. 16 mines: 33218316 0 01MM3 245MM MMM6M M8M7M MMMMM 16 mines: 33209884 0 01MMM 2456M MMMM3 M8M7M MMMMM 15 mines: 8060444 0 01MMM 2457M MMMMM M8M6M MMM3. 15 mines: 15924764 0 01MMM 2457M MMMMM M8M63 MMMM. 15 mines: 24313372 0 01MMM 2457M MMMMM M8M63 MMM.M 15 mines: 30080540 0 01MMM 2457M MMMMM M6M8M .3MMM 15 mines: 31096348 0 01MMM 2457M MMMMM 36M8M M.MMM 15 mines: 32144924 0 01MMM 2457M MMMMM 36M8M .MMMM 15 mines: 33218192 0 01.3M 24M5M MMM6M M8M7M MMMMM 15 mines: 5963420 1 0.MMM 25M8M MMMMM M7M6M M4M31 15 mines: 8027804 1 0.MMM 25M8M MMMMM 47M6M MMM31 15 mines: 8060060 1 0.MMM 25M74 MMMMM M8M6M MMM31 15 mines: 8060444 1 0.MMM 2457M MMMMM M8M6M MMM31 15 mines: 8060564 1 0.M4M 25M7M MMMMM M8M6M MMM31 15 mines: 13827740 1 0.MMM 25M8M MMMMM M7M63 M4MM1 15 mines: 15892124 1 0.MMM 25M8M MMMMM 47M63 MMMM1 15 mines: 15924380 1 0.MMM 25M74 MMMMM M8M63 MMMM1 15 mines: 15924764 1 0.MMM 2457M MMMMM M8M63 MMMM1 15 mines: 15924884 1 0.M4M 25M7M MMMMM M8M63 MMMM1 15 mines: 21692060 1 0.MMM 25M8M MMMMM M6M7M 13M4M 15 mines: 23756444 1 0.MMM 25M8M MMMMM 36M7M 1MM4M 15 mines: 24313372 1 01MMM 2457M MMMMM M8M6. MMM3M 15 mines: 24837260 1 0.MM1 25M63 MMMMM M8M7M MMM4M 15 mines: 24837764 1 0.M31 25M6M MMMMM M8M7M MMM4M 15 mines: 29556380 1 0.MMM 25M8M MMMMM M6M74 13MMM 15 mines: 30080156 1 0.MMM 25M74 MMMMM M6M8M 13MMM 15 mines: 30080540 1 0.MMM 2457M MMMMM M6M8M 13MMM 15 mines: 30080660 1 0.M4M 25M7M MMMMM M6M8M 13MMM 15 mines: 31096348 1 01MMM 2457M MMMMM .6M8M M3MMM 15 mines: 31127192 1 0.2MM 13M7M M5MMM M6M8M M4MMM 15 mines: 31128092 1 0.MMM 1357M 2MMMM M6M8M M4MMM 15 mines: 31128716 1 0.MM1 25M63 MMMMM M7M8M M4MMM 15 mines: 31129220 1 0.M31 25M6M MMMMM M7M8M M4MMM 15 mines: 31620764 1 0.MMM 25M8M MMMMM 36M74 1MMMM 15 mines: 32144540 1 0.MMM 25M74 MMMMM 36M8M 1MMMM 15 mines: 32144924 1 0.MMM 2457M MMMMM 36M8M 1MMMM 15 mines: 32145044 1 0.M4M 25M7M MMMMM 36M8M 1MMMM 15 mines: 32701580 1 0.MM1 25M63 MMMMM M8M74 MMMMM 15 mines: 32702084 1 0.M31 25M6M MMMMM M8M74 MMMMM 15 mines: 33193100 1 0.MM1 25M63 MMMMM 47M8M MMMMM 15 mines: 33193604 1 0.M31 25M6M MMMMM 47M8M MMMMM 15 mines: 33218192 1 0.13M 24M5M MMM6M M8M7M MMMMM 15 mines: 33223832 1 0.2MM 13M64 M5MMM M7M8M MMMMM 15 mines: 33224732 1 0.MMM 13564 2MMMM M7M8M MMMMM