Several versions of xsokoban are
You can consult
the log of recent changes, which
describes differences between these versions.
The most recent
An older version,
3.3b is also available.
was published in
the newsgroup comp.sources.x (It still seems to work acceptably)
Actually, so were versions
Smaller bitmaps are also available for users with small
(e.g. 640x480) screens.