Reference

SourceForge - Balls Blocks and Mazes
http://bbm.sourceforge.net/?Main_Page

via

MOONGIFT - Balls Blocks and Mazes
http://oss.moongift.jp/intro/i-1865.html
MOONGIFT - Balls Blocks and Mazes レビュー
http://oss.moongift.jp/review/i-1872.html