https://en.wikipedia.org/wiki/Sokoban

Sokoban (warehouse keeper) is a type of transport puzzle, in which the 
player pushes boxes or crates around in a warehouse, trying to get them 
to storage locations.

Sokoban was created in 1981 by Hiroyuki Imabayashi, and published in 
1982 by Thinking Rabbit, a software house based in Takarazuka, Japan.

## Rules ###############################################################

The game is played on a board of squares, where each square is a floor 
or a wall. Some floor squares contain boxes, and some floor squares are 
marked as storage locations.

The player is confined to the board, and may move horizontally or 
vertically onto empty squares (never through walls or boxes). The 
player can also move into a box, which pushes it into the square 
beyond. Boxes may not be pushed into other boxes or walls, and they 
cannot be pulled. The puzzle is solved when all boxes are at storage 
locations.

------------------------------------------------------------------------

This text is available under the Creative Commons 
Attribution-ShareAlike License; Wikipedia® is a registered trademark of 
the Wikimedia Foundation, Inc., a non-profit organization.

Last modified on 21 April 2015, at 00:00.
