# 3.4. Level authors

The levels are copyrighted by their authors:

Original

  the first 50 original levels from xsokoban, by various authors. These levels are public domain

Extra

  some more levels from xsokoban. Also public domain

Still more

  by J. Franklin Mentzer <wryter@aol.com>

MacTommy inventions

  by Tommy in Pennsylvania

Yoshio's autogenerated

  by Yoshio Murase <yoshio@asahi.email.ne.jp>

  See also http://www.ne.jp/asahi/ai/yoshio/sokoban/main.htm where he puts a new sokoban level every week.

For the kids

  by Ross (W.R.) Brown <ross@bnr.ca>

Dimitri & Yorick

  by Jacques Duthen <duthen@club-internet.fr>

Simple Sokoban

  simplified original levels by Phil Shapiro <pshapiro@his.com>