The Snake

This is one of the new possible maps for Sokoban Level 3 in Hack'EM. It has 12 boulders and 10 holes, leaving 2 spare boulders.

  ---------              0 boulder
 --.......--             ^ hole
 |..--.--..|             > starting position/downstairs
 |.0.0.0.0.|     -----   < upstairs
 |..-|.|-..|     |...|   + door
---..|.|..---    |.{.|   s secret door
|.....0.....|    |...|   { fountain
|..|..0..|..|  ----s----
|-0|0---0|0-|  |.......|
|..|..0..|..|  |.......|
|.....0.....|  |...<...|
---.--.--.---  |.......|
  |.......|    |.......|
  ---.>.---    ----+----
    |...|         |.|
    |...-----------.|
    |....^^^^^^^^^^.|
    -----------------

Strategy

  ---------              A uurr r
 --.......--             B dd
 |..--.--..|             C r
 |.I.J.K.L.|     -----   D dddd ddrr r
 |..-|.|-..|     |...|   B rrdd dddd rrrr
---..|.|..---    |.{.|   C ll
|.....H.....|    |...|   F uull l
|..|..G..|..|  ----+---- E ddll dddd ddrr rrr
|-A|B---E|F-|  |.......|
|..|..C..|..|  |.......|
|.....D.....|  |...<...|
---.--.--.---  |.......|
  |.......|    |.......|
  ---.>.---    ----+----
    |...|         |.|
    |...-----------.|
    |....^^^^^^^^^^.|
    -----------------

  ---------              C ldrr dddd ddrr rrrr
 --.......--             G rrdd dlld dddd drrr rrrr
 |..--.--..|             H drrd ddll dddd ddrr rrrr rr
 |.I.J.K.L.|     -----   A rdrr dddl lddd dddr rrrr rrrr
 |..-|.|-..|     |...|   F ldrr dddl lddd dddr rrrr rrrrr
---..|.|..---    |.{.|   I dddr rrdr rddd lldd dddd rrrr rrrr rrr
|....AHF....|    |...|   L dddl lldr rddd lldd dddd rrrr rrrr rrrr
|..|..G..|..|  ----+----
|-.|.---.|.-|  |.......|
|..|.C...|..|  |.......|
|...........|  |...<...|
---.--.--.---  |.......|
  |.......|    |.......|
  ---.>.---    ----+----
    |...|         |.|
    |...-----------.|
    |.......^^^^^^^.|
    -----------------