2015 Advent Day 18
This is (sarcastically) the most difficult sub-puzzle of the year. Today's sudoku piece uses difference clues, but those clues are shrouded by mystery in the form of... dot-to-dot. BEFORE AREA 51, BEFORE SLITHERLINK AND MASYU, THERE WAS... this... yeah.

On a more serious note, I tend to overclue parts of the yearly #PuzzleAdventCalendar to make it a bit more accessible to everyone. With that in mind, a little birdy (or foxger, rather) tells me day 19's sudoku piece is already solvable. With that in mind, it's skippable, but should lend a hand if you have any gaps in the top grid.

Until then, day 18: http://thegriddle.net/829

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