Easy 1:
Constructed with the online sudoku puzzle builder from Amuse Labs
Easy 2:
Created using PuzzleMe’s free sudoku maker
Medium 1:
Made with the free sudoku puzzle generator from Amuse Labs
Medium 2:
Built using PuzzleMe’s sudoku puzzle creator
Hard 1:
Made with the sudoku puzzle creator from Amuse Labs
Hard 2:
Created with the free sudoku maker from Amuse Labs