Diagonal

Continued research into the issue of Anti-Quadruples has exposed why we had not seen them before. They are best detected not by observing them directly, but by observing what isn’t there.

There’s really no point in having two fully-populated quadruples clues in a box. They only touch seven cells between them, so giving you four digits is overkill.

Irish pub cuisine, or a Gattai-3 Sudoku puzzle? You decide!

It's a Sudoku-X! It's a spiral of givens! It's oh-so-many easy-to-find "naked" singles!

It’s an X-Killer, get it? Okay, it’s not very subtle.

It may seem like a lot of constraints, but it's a Samurai Sudoku, so you should only have deal with one or two at a time.

Not a commentary on computer operating systems at all.

Those are some pretty small numbers in those cages. Almost too small. Almost. I’ve been doing “Sudoku-X” puzzles almost as long as I’ve been doing Sudoku puzzles, but around these parts, we call those “diagonals.” If you’re feeling a bit of déjà vu, see also: High Killer X.

Those are some pretty big numbers in those cages. Almost too big. Almost. I’ve been doing “Sudoku-X” puzzles almost as long as I’ve been doing Sudoku puzzles, but around these parts, we call those “diagonals.” If you’re feeling a bit of déjà vu, see also: Low Killer X.

Senior year is here, and you’ve really made a home for yourself on campus. You’ve now mastered The Quad. You take shortcuts across the quad to get where you need to go, and it helps you avoid people–and given digits.