Suqoku v0.68 (2013/09/10) is available for OS/2 and eComStation.

Suqoku is a sudoku game written in Qt 4.
This port requires the Qt 4 libraries and libc libraries.
Link: ftp://ftp.netlabs.org/pub/qtapps/Suqoku-0.68-os2.7z
Web: http://www.konarski-wuppertal.de/andreaskw/Suqoku.html
Port by Elbert Pol