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This is one of the new possible maps for Sokoban Level 4 in Hack'EM. It has 12 boulders and 10 holes, leaving 2 spare boulders.

--------------- 0 boulder
|..^^^^^^^^^^<| ^ hole
|..------------ > starting position/downstairs
--..0..|>....|  < upstairs
 |..00.|..0.0|  ? scroll of earth
 |.0...|.0.0.|
 |--.-------.--
 |....|??|....|
 |.0..|....0..|
 |.0........0.|
 |....---------
 ------

Strategy

--------------- D dddd
|..^^^^^^^^^^<| K lluu r
|..------------ J ulll uurr
--..K..|>....|  I ullu urrr
 |..IJ.|..B.D|  G ruuu uull uurr rr
 |.H...|.A.C.|  F uruu uuul luur rrrr
 |--.-------.-- H rddd uuuu ullu urrr rrr
 |....|??|....|
 |.G..|....E..|
 |.F........F.|
 |....---------
 ------

--------------- F llll llll uuuu uull uurr rrrr r
|........^^^^<| E dlll llll uuuu uull uurr rrrr rr
|..------------ D dlll llll luuu uuul luur rrrr rrrr
--.....|>....|  B rrdd dddl llll lllu uuuu ullu urrr rrrr rrr
 |.....|..B..|
 |.....|.A.C.|
 |--.-------.--
 |....|??|....|
 |....|....ED.|
 |..........F.|
 |....---------
 ------