Sudoku za kuchapisha za 2011 — kiwango ngumu sana (PDF bila malipo)
Pakua sudoku 365 za kiwango ngumu sana za 2011 katika PDF bila malipo.
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Miaka mingine
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Ngumu Sana — Kitabu cha Sudoku 2016
Ngumu Sana — Kitabu cha Sudoku 2015
Ngumu Sana — Kitabu cha Sudoku 2014
Ngumu Sana — Kitabu cha Sudoku 2013
Ngumu Sana — Kitabu cha Sudoku 2012
Ngumu Sana — Kitabu cha Sudoku 2011
Ngumu Sana — Kitabu cha Sudoku 2010
Ngumu Sana — Kitabu cha Sudoku 2009
Ngumu Sana — Kitabu cha Sudoku 2008
Ngumu Sana — Kitabu cha Sudoku 2007
Ngumu Sana — Kitabu cha Sudoku 2006
Ngumu Sana — Kitabu cha Sudoku 2005
Vitabu vyote vya kiwango ngumu sana