Two-Phase

This is one of the new possible maps for Sokoban Level 2 in Nethack Fourk and Level 3 in Hack'EM. It has 17 boulders and 14 holes, leaving 3 spare boulders.

----------                 0 boulder
|........|                 ^ hole
|........|                 > starting position/downstairs
|...<....|------------     < upstairs
|........|..>..|.....----- + door
|........|.0.0.+000.0....|
|..----+-|0.0.0|....0..0.|
|---..|.--.---.----.----.|
|..^^.|^|....-..| |...0..|
|.^|..|^|.....0.---......|
--^|..0^|.0...-....0.....|
 |^|....|.---...---.------
 |^------.0..........|
 |..^^^^^.......------
 |..-------------
 ----

Strategy

----------                 A ddd
|........|                 G ldl
|........|                 F lddd ll
|...<....|------------     A dldd dlll
|........|..>..|.....----- H llll lddd dlll l
|........|.B.D.+KLM.N....| E u
|..----+-|A.C.E|....O..P.| C lldd ddld ddll lll
|---..|.--.---.----.----.|
|..^^.|^|....-..| |...J..|
|.^|..|^|.....H.---......|
--^|..Q^|.F...-....I.....|
 |^|....|.---...---.------
 |^------.G..........|
 |..^^^^^.......------
 |..-------------
 ----

----------                 B dldd ddld ddll llll lu
|........|                 E d
|........|                 D lldl dddd lddd llll lllu u
|...<....|------------     E dddl llll dddd llll lllu uu
|........|..>..|.....----- I rlll lldd llll lldl llll lluu uu
|........|.B.DE+KLM.N....|
|..----+-|.....|....O..P.|
|---..|.--.---.----.----.|
|..^^.|^|....-..| |...J..|
|.^|..|^|.......---......|
--^|..Q^|.....-....I.....|
 |^|....|.---...---.------
 |^------............|
 |..............------
 |..-------------
 ----

----------                 N lddd ddll lldd llll lldl llll lluu uuur
|........|                 O lddd dlll lddl llll ldll llll luuu uurr
|........|                 Q r
|...<....|------------     P llll dddd llll ddll llll dlll llll uuuu urrr ddrr u
|........|..>..|.....----- J llld dlll lddl llll ldll llll luuu uurr rddr ruu
|........|.....+KLM.N....|
|..----+-|.....|....O..P.|
|---..|.--.---.----.----.|
|..^^.|^|....-..| |...J..|
|..|..|^|.......---......|
--.|..Q^|.....-..........|
 |.|....|.---...---.------
 |.------............|
 |..............------
 |..-------------
 ----