Sudoku za kuchapisha za 2019 — kiwango ngumu sana (PDF bila malipo)
Pakua sudoku 365 za kiwango ngumu sana za 2019 katika PDF bila malipo.
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Ngumu Sana — Kitabu cha Sudoku 2015
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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
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Ngumu Sana — Kitabu cha Sudoku 2005
Vitabu vyote vya kiwango ngumu sana