The "Empty Grid" Sudoku

*** Join Simon at 10pm UK time tonight - 90 minutes after this video goes live - for his attempt at The Music Box Challenge in The Witness.  Link here:
Sudoku Expert Takes The Witness Chall...

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We suspect you won't have seen a sudoku like today's ever before.  Not even The Miracle Sudoku was quite so sparse.  That's right Empty Grid by Jodawo literally has nothing in the grid at all.  What is going on?!?! You can play the puzzle at the following link:

https://app.crackingthecryptic.com/su...

Rules:
In this puzzle ‘2-digit numbers’ read from left to right or downwards. Box 1 (NW) will contain all the 2-digit square numbers (16, 25, 36, 49, 64, and 81), which may overlap but must be entirely contained within the box. Box 9 (SE) is a clone of box 1, rotated through 180°. In each of boxes 3 (NE), 5 (centre) and 7 (SW), each digit will contribute to at least one 2-digit prime number contained within that box. Box 4 (W) is a magic square, with each row, column, and 3-digit diagonal summing to the same total. In each of box 6 (E) and 8 (S), the two 3-digit diagonals sum to the same number (NB box 6's number may be different from box 8's number).

** Botaku Bonus Puzzle **
As mentioned in the video, we have a bonus puzzle today from the brilliant Botaku.  It's called Euclidean Sudoku!  You can play it at the link below and watch a video of Simon solving it on our Patreon page.

Patreon: crackingthecryptic

Play the puzzle here:
https://app.crackingthecryptic.com/su...
SudokuPad link: https://tinyurl.com/4t74y7rs

Rules:
Normal sudoku rules apply. Given two cells which both contain the digit N, the Euclidean distance between (the centres of) those cells must be at least √N times the sidelength of a single cell. In other words, if moving from one such cell to the other takes X horizontal steps and Y  vertical steps, then √(X^2 + Y^2) ≥ √N.

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Hi! We're Simon Anthony and Mark Goodliffe, two of the UK's most enthusiastic puzzle solvers. We have both represented the UK at the World Sudoku Championships and the World Puzzle Championships.

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Simon and Mark