It doesn't look as if Euler was involved with the invention of Sudoku. http://en.wikipedia.org/wiki/Sudoku#History
No, you can do Sudoku with letters or shapes sometimes. You don't actually have to add or subtract or do math calculations when playing it.
Sudoku
I am assuming you are referring to a normal 3x3 sudoku grid, where you can only use the numbers 1-9 once in the grid, and by prime number you mean the 3digit number across and down the grid must be prime? For a number to be prime, it must end in 1, 3, 7 or 9. There are 5 places on the Sudoku grid for a number to finish and as you can only use a number once in sudoku you have one place left where the number can not be prime. This means the most you can have is 5 prime numbers.
A sudoku box cannot contain 5 prime numbers, so it is obviously an error. And once you accept that the numbers in the box are simply nonsense numbers, anything is possible.
Sudoku is a noun.
Lovers of sudoku can visit the BrainBashers website where they can find daily sudoku games. Billions of free sudoku can also be found on Websudoku. This is unlimited and can be played on all devices such as android or Ipad.
Zen of Sudoku was created in 2006.
Zen of Sudoku happened in 2006.
Sudoku Gridmaster happened in 2006.
Rubik's Sudoku was created in 2006.
Buku Sudoku happened in 2006.
There are several places where one can play sudoku online. Some interactive online sudoku websites include Web Sudoku, Sudoku Saviour, and You Play. Sudoku puzzles can also be printed out and completed by hand, and these types of puzzles can also be found on these websites.
Pyramid sudoku is a regular sudoku board with shaded areas. Not only does one need to complete the regular sudoku, but the shaded areas can only have 1-9 as well.
It doesn't look as if Euler was involved with the invention of Sudoku. http://en.wikipedia.org/wiki/Sudoku#History
Sudoku (: Sudoku (:
Not sure there is such a thing, actually. Sudoku has been around for a long time. Check it out: http://en.wikipedia.org/wiki/Sudoku