One of the best Sudoku makers is Nikoli as they design the Sudoku’s they publish by hand.
Now there is also an electronic Sudoku Game available with 99 different Sudoku’s. If you want to be the first to own this neat little device you can buy Franklin Electronic Sudoku Game by Nikoli from Amazon.co.uk.
Settings for beginners, intermediate and advanced enthusiasts. Details: operated by two AA batteries, supplied; 14.5 x 9 x 2.5 cm (5 3/4″ x 3 1/2″ x 1″). Happy Puzzling!
You can also buy other Nikoli Slitherlink puzzle books at Amazon.com.