gyjgw - "knots of boxes"

    ###### #####
 ####  # ### # #
 #  #### # #####
 #          * #
## **** # # # #
#     *## # # #
#**** * @** # #
#    * *#     #
# * * * ##*$#####
# ***  **       #
#   * **  **  * #
#*  * * *  ** * #
# ** **  **  ** #
#   ** * * *   ##
# ** # * *  * ##
#  * # .*** ###
##   #      #
 ############

Author: 随风而逝 + gyjgw
Title: 《睿斗推箱子》45关：纪念918 (Level 45: Commemoration of 918) a
Date: 2012.9.19
URL: bbs.mf8-china.com/forum.php?mod=viewthread&tid=37579&extra=page%3D1&page=99

The most important element of a puzzle is the structure. The structure is formed by the exterior and interior walls of the puzzle. However, observed that the boxes can work as a special kind of "walls", i.e. as "mobile walls" (which become "fixed" walls once placed permanently in the goals).

This is a simple example of puzzle which the boxes operate as "mobile walls" (David Holland described this type of structures such as "dynamic topology": see "The two styles of Sokoban"):

########
#  #   #
# *  . #
# * *  #
# ** ###
# * *  #
# *$ * #
# @ #  #
########

Author: Jordi Domenech
Title: Magic Sokoban 1 #95 K

This peculiar property of the boxes allows the creation of puzzles with internal structure consisting of authentic "knots of boxes", which give rise to puzzles of great difficulty. In the Chinese forum MF8 are very appreciated this kind of puzzles, and of course "gyigw" is an expert one: a good example is this nightmare of "knot of boxes" (Level 45 a) that I only recommend to experienced players.