The maddest sudoku puzzle I've ever seen

Given a few simple constraints and an impossible-looking board, watch this sudoku expert try to figure out if this puzzle is solvable.

The rules:
- Standard sudoku rules
- Any two cells separated by a chess knights move or a kings move can't have the same digit
- Any two orthoganally adjacent cells cannot contain consecutive digits
fuzzyundiessays...

Right, how many of you paused the video, then went and finished the puzzle? It's actually not hard past the first 3 or 4 numbers, thanks to the added constraints.

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