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Ah...the joys and challenges of Sudoku!  As a group we shared our individual feelings, which was an excellent model for how our students experience success, in the face of trial, error, 'getting it', and having fun while learning.  THIS is why my classes were often noisy, because students in groups were engage in learning.  So why is this often mistaken as a lack of discipline, especially by those colleagues who are struggling to have their students sits as soldiers and it doesn't work and their so-called prepared lesson is not getting taught or learned?