#381-385: Revisiting 4x4 Sudoku

 made on 5/26/23

Back in August 2022, Cray had introduced a few 4x4 Sudoku variants.


381. Square Sum Sudoku

https://f-puzzles.com/?id=2pyegd67

382. Invisibulb Sudoku (very hard!)

https://f-puzzles.com/?id=2e2jf6vr

383. Invisibulb and Square Sum

https://f-puzzles.com/?id=2l869w9t

384. Invisibulb or Square Sum?

https://f-puzzles.com/?id=2h4vucpr


This also inspired me to do something silly:

https://f-puzzles.com/?id=2zrnhym6

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