Comment There are no hard sudoku (Score 2) 74
I'm not being flippant or showing off, but for a while when they first came about in the UK papers I was partial to the odd Sudoku and in order to speed up the process of grid filling, I printed out some prepared grids with all the little numbers (the ones you're supposed to pencil in) in every single box.
Then after filling in the published starting numbers it became a simple task to simply black out those small numbers that were no longer possible i.e all the ones of the same number in the same square, row or column). Then almost invariably I'd be left with a number of squares that could be filled and the process repeated. Then, as with normal play I'd find a row column or square with pairs or triples of numbers enabling other numbers to be black out. This would solve most Sudoku, and it didn't even require any thinking.
And that's what ultimately weaned me off the things. I was essentially imitating a computer process, blacking out and filling in numbers as the rules laid down allowed. In other words utterly pointless and boring.
There are puzzles this won't solve, but then there's no actual skill to be employed in solving those ones either. Sudoku guides would bill this as "ariadne's thread", but ultimately it comes down to guesswork. When you're stuck then you have to pick a square and take a guess. If you're right, and it works, you solve the puzzle, otherwise your guess was wrong, you go back to where you were and choose the other number. To give it another name: brute force. No skill, no intelligence, just number crunching. Sudoku puzzles aren't puzzles at all, they're just an exercise in box filling.