Boomerang Boulders

This is one of the new possible maps for Sokoban Level 1 in Nethack Fourk and Level 2 in Hack'EM. It has 12 boulders and 10 holes, leaving 2 spare boulders.

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

Strategy

All boulders are replaced by letters so they can be referred to. Moving the boulders is shortened to r for right, l for left, u for up, d for down. An asterisk is used to denote the last move filled a pit (and thus removed the boulder from the game). So "N ddrr*" means move boulder N two times down and two times to the right into a pit.

         ----     A ll*
 ---------..---   B ull*
 |.L.K....J...--- C uuud ddd
 |.......|I..H..| D u
---------|....G.| C llll llul ll*
|.^^^^^^<|...F..| E llll llll ulll u*
|.^------|-.----- D luuu dddd llll llul lluu*
--^^^.A..|.C...| 
 |..|B.>....DE.| 
 ---|....|.....| 
    ------------ 

         ----     H d
 ---------..---   F lldd dlll lllu lllu ur*
 |.L.K....J...--- H dlld ddll llll ulll uurr*
 |.......|I..H..| G dlll dddl llll lull luur rr*
---------|....G.|
|..^^^^^<|...F..|
|..------|-.-----
--.......|.....| 
 |..|..>.......| 
 ---|....|.....| 
    ------------ 

         ----     J lllr rrrd dddd dlll lllu lllu urrr r*
 ---------..---   I ulll rrrr dddd ddll llll ulll uurr rr*
 |.L.K....J...---
 |.......|I.....|
---------|......|
|.....^^<|......|
|..------|-.-----
--.......|.....| 
 |..|..>.......| 
 ---|....|.....| 
    ------------