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50. Semi-Century

Big block of text for the uni lore moment and big block of text for the puzzle rules

On September 21, 2026, I woke up when the hour was an odd number and the minutes were in the low twenties, if I remember correctly. And my first class in uni on that day was at 8 AM. So I panicked and immediately went to go take a shower (b/c I didn't hear an alarm ring too). But when I came back to my room, the time I saw on my phone was not in the 7:30s --- it was in the 3:30s. Meaning I had woken up about 3 hours earlier than the times I tend to wake up at.

I didn't want to go back to sleep because I feared that I would sleep through the alarms I had set (on my new phone lol) and wake up at a time where it would be basically impossible to make it to class on time. So, I decided to work on some stuff, including a module for one of my other classes (that way I could at least get something productive done).

I also verified this puzzle during that time because I had the time and I realistically didn't need to leave my room again until at least 6:30 AM. But this puzzle was set a few days before I verified it though.

And then later that day, I noticed something a bit weird about mutual servers. Specifically, there was a pretty prominent user in one of my other servers, who was also in a club server for uni. And I tend to join the clubs that interest me the most (math, puzzles, etc.), SO I MIGHT ACTUALLY BE COOKED AAAAAAA

But anyways, back to the puzzle. You might recognize some of my past sudokus in here, especially ones in the 40s in my blog. But anyways, cheers to another 50 puzzles!

Creator's time: 40:41

Rules: Normal 9×9 Sudoku rules do NOT apply. Place a digit from 0 to 9 in each cell such that digits do not repeat in a row, column, or 3×3 box.

Variant 1: 0-8 Box \ Box 1 (top-left) must contain the digits from 0-8.

Variant 2: 1-9 Boxes \ Boxes 3, 7, and 9 (top-right, bottom-left, and bottom-right) must each contain the digits from 1-9.

Variant 3: Tennis Balls \ Digits separated by a tennis ball have a product of either 0, 15, 30, or 40. 

Variant 4: Kropki \ Digits separated by a white dot have a difference of the number inside the dot; digits separated by a black dot have a ratio of 1:n, where n is the number inside the dot.

Variant 5: German Whispers \ Adjacent digits along a green German Whispers line must have a difference of at least 5.

Variant 6: Killer Cages \ Digits inside a killer cage do not repeat and sum to the value in the top-left corner of the cage.

Variant 7: Dutch Whispers \ Adjacent digits along an orange Dutch Whispers line must have a difference of at least 4.

Variant 8: Factor Lines \ For every pair of adjacent digits on a line, one must be a factor/multiple of the other

Variant 9: Renban \ Digits on a magenta Renban line form a set of non-repeating, consecutive digits in any order.

Variant 10: Friendly Cells \ Digits containing a small heart symbol must match their row, column, or box number.


Difficulty: 9.5/14

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