I recently started playing nethack and got frustrated with having to play quite
a while to get to sokoban and then being unable to solve it. So I wrote this
little python app which contains all 8 sokoban levels from nethack, allows
undo/redo and recording of sessions to file.

The movement keys are the same as in nethack (both, hjklyubn and numpad should
work). Additionally the following keys are used:

q		quit
r		restart
a		nextLevel
z		prevLevel
s		redo
x		undo

In playback-mode space is used to advance one step, q quits the program.

If you don't like the keybindings change the variables 'game_keybindings' and
'playback_keybindings' in nethack-sokoban.py.