The annual Dr Denker puzzle has been published in the Leeuwarder Courant and the Dagblad van het Noorden on Saturday 21 December 2019. It's a challenging puzzle and guides can be nice. 

You may have found an answer, but you are doubtful about its correctness. You can then check your answer using the roderik.net website answer checker. You won't find answers here, but this helpline shows how many puzzlers have a different answer. 

The control for the Dr. Thinker answers 2019 find you here


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