Just found it again! Here’s one of the grids I generated:
0 1 2 3 4 5 6 7 8 ---------------------------- 0 | . . 9 | . 6 5 | 8 3 . | 1 | . . 6 | 4 . . | . . . | 2 | . 4 . | 7 . 9 | 6 . . | ---------------------------- 3 | . 3 2 | . . . | . . . | 4 | . . . | 3 7 2 | . . . | 5 | . . . | . . . | 9 2 . | ---------------------------- 6 | . . 5 | 1 . 7 | . 8 . | 7 | . . . | . . 6 | 4 . . | 8 | . 7 4 | 5 8 . | 1 . . | ----------------------------
Enjoy!

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