Quadruples

Testing hypothesis: For every constraint, there is an equal and opposite anti-constraint. Research into quadruples has turned up anti-quadruples in far greater quantities than theory suggested. Further research will be required.

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.

Can I interest you in a fine manufactured home? It’s so wide! Almost, but not quite, twice as wide as a single-wide. In fact, it’s 1.67 times as wide, and 1.33 times as tall as a normal 9x9 Sudoku.

These are not normal quadruples clues; these are specifically-ordered quadruples clues. This is the fourth of four puzzles exploring using Fog of War.

They’re Quadruples even when they don’t contain four digits, because they still give information about four cells. Right? Let’s go with that. These Quadruples clues contain only one or two digits, but to make up for that, I’ve put a quadruple of Quadruples into each 3x3 box. With 36 Quadruples clues, I think they don’t really need more digits.

Sometimes a puzzle is less about what goes where, and more about what doesn’t go there.

The rain is gone! I can see all obstacles in my way. Gone are the dark clouds that had me blind. It’s going to be a bright, bright Sudoku day.

The azul sky out the windows puts on in the mind of a beach in Mexico. How many windows? Uno, dos, tres, quatro!

What time is it? Four-thirty. It's not late, no. No! It's early, early.

Arrows point this way and that, and you’re seeing double more often than not, but this shouldn’t pose a problem for you. You’re savvy. You know which way the arrow’s pointing.