Danny McGrath's guess was correct. The execution loops in Puzzle::createPartial() until a solution is found.
I have made a upstream bug report: https://bugs.kde.org/show_bug.cgi?id=245756 ** Bug watch added: KDE Bug Tracking System #245756 http://bugs.kde.org/show_bug.cgi?id=245756 ** Also affects: kdegames via http://bugs.kde.org/show_bug.cgi?id=245756 Importance: Unknown Status: Unknown -- KSudoku freezes when starting 25x25 game https://bugs.launchpad.net/bugs/552315 You received this bug notification because you are a member of Kubuntu Bugs, which is subscribed to kdegames in ubuntu. -- kubuntu-bugs mailing list kubuntu-b...@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs