The Most-Perfect 4x4 Puzzle Game (IPP34) by Jeremiah Farrell / Kadon

The Most-Perfect 4x4 Puzzle Game (IPP34) by Jeremiah Farrell / Kadon 

Place the 16 disks on the 4x4 grid so that all of the following conditions are met at the same time:

1. Every row and column sums to 16.

2. All 8 diagonals (including the 6 broken ones) sum to 16.

3. The nine 2x2 squares each sum to 16. There are 3 rows of 3 of these.

4. The four comers sum to 16.

5. The four corners of all four 3x3 squares sum to 16.

6. The corners of all 2x4 rectangles sum to 16. 

From IPP 34 held in London, England in 2014.

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