Henk Nicolai is known as Qodec in the CTC community. He set his original puzzles using pencil and paper. His first feature on CTC is Orbit which is an Arrow and Little Killer variant with some even/odd given cells. His showcase video provides an insight into the mind of Qodec 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.
