Creation of Sudokus
Creation of a normal Sudoku
Place number 1 by random. But only one 1 in a row and only one 1 in a column.
Place another number by pattern as shows.
Since the pattern are too recognizable swift some numbers.
Now you got the solution to a normal Sudoku.
Remarks: generators to Sudokus as above you find on the Internet.
Sudoku with letters
In a dictionary look for a word with 9 letters. Every letter should occour only one time.
Pick any row or column. In this example marked grey. Change a number to a letter.
Now you got a solution to a Sudoku with letters, containing a 9 letter word.
Creation of a 16 x 16 Sudoku
Use 16 different letters. Do as above.