Simplify the following text for a Grade 7 native English-speaking person.
Original: Jigsaw Sudoku ( also called Squiggly Sudoku or Odd Sudoku ) is just like a regular Sudoku puzzle , except that instead of the lines being perfect , they are different .
Simplified: A three-dimensional Sudoku puzzle was invented by Dion Church and published in the Daily Telegraph in May 2005 . There is a Sudoku version of the Rubik 's Cube named Sudoku Cube .