The Times su doku

 

The most elegant of all Sudoku versions, in a black box, a board with rims, where the number tiles can be placed safely without moving. The game offers 100 puzzles in four grades of difficulty. The variant for two players uses green numbers to lay out the puzzle, then both players use one colour to place numbers. When all numbers are placed, both players check the solution and count the numbers they placed correctly, the player using green must deduct the number of tiles used to lay out the puzzle.