Sokoban Level 3a

This version of the third level of sokoban has 16 boulders and 10 holes. 0 boulder ^ pit @ starting position/downstairs < upstairs

---.|....| |...0....|-- |.-.00-00|.|.......| |.00-......|.......| |.-..0.|...|.......| |....-0--0-|...<...| |..00..0...|.......| |.--...|...|.......| |....-0|---|.......| ---..0.---+|  |..0@^^^^^^^^^^^.|   --

Strategy
The following solution solves the level without putting any blocks in an immobile position. Faster solutions which do not leave every boulder free exist.

All boulders are replaced by letters so they can be referenced 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 Nddrr* means move boulder N two times down and two times to the right into a pit.

---.|....| |...A....|-- |.-.BC-DE|.|.......| |.FG-......|.......| |.-..H.|...|.......| |....-I--J-|...<...| |..KL..M...|.......| |.--...|...|.......| |....-N|---|.......| ---..O.---+| |..P@^^^^^^^^^^^.| --

First clear up the lower part of the room. The opening move is the only one possible. Make sure you move the O boulder out of the way when finishing he L boulder. Oll Prr* Nddrr* LdddOuLrrdrrr* Orddrrrrrr* Krddddrrrrrrr*

---.|....| |...A....|-- |.-.BC-DE|.|.......| |.FG-......|.......| |.-..H.|...|.......| |....-I--J-|...<...| |......M...|.......| |.--...|...|.......| |....-.|---|.......| ---....---+|  |...@.....^^^^^^.|   --

Clear the upper left corner. Gdddrddddrrrrrrrr* Frdddrddddrrrrrrrrr* Now enter the small room in the middle and finish boulder M Mrrlllllddddrrrrrrrrrr* Enter the room just above J and finish H and I Juu Idddddrrrrrrrrr* Hrddddddrrrrrrrrrr*

---.|....| |...A....|-- |.-.BC-DE|.|.......| |...-....J.|.......| |.-....|...|.......| |....-.--.-|...<...| |..........|.......| |.--...|...|.......| |....-.|---|.......| ---....---+|  |...@..........^.|   -- Enter the top room through A and push C out, afterwards all boulders can still be moved around freely and should be checked for wands or rings. Arr Cddrddddddrrrrrrrrrrr*

---.|....| |.....A..|-- |.-.B.-DE|.|.......| |...-....J.|.......| |.-....|...|.......| |....-.--.-|...<...| |..........|.......| |.--...|...|.......| |....-.|---|.......| ---....---+|  |...@............|   --