The Cogito is another clever setter that has astonished Simon and Mark on Cracking The Cryptic. His first feature on CTC is Staggered which is a partial 159 sudoku with Renban and German Whisper lines. His showcase video provides an insight into how he sets puzzles and can be viewed by clicking the play button in the centre of the video above.
Selecting a sudoku title will allow you to play it, selecting Simon or Mark image next to the title will allow you to watch it.
