Logic Masters Deutschland e.V.

Slow And Schrödy

(Published today, 03:38 by gdc)

This puzzle was set for ChinStraps stream on the Sudoku Twitch Train which is happening right now (see below)! It combines some of ChinStraps favorite constraints: squishdoku, S-cells, indexing and "escape the grid". According to testers (thanks everyone!), it should be around 4*. Hope you enjoy!

Schrödinger Squishdoku: Place one or two of the digits 0-9 in every cell of the main 7x7 such that each 3x3 box includes all digits 0-9 exactly once and there are no repeated digits in any row or column. Cells on region borders (dashed lines) are shared between boxes.
Row/Column Indexers: If a digit D is in a cell with left/right arrows in rRcC, then the digit C must be in rRcD. If a digit D is in a cell with up/down arrows in rRcC, then the digit R must be in rDcC. 9 is not allowed in indexer cells. Outside cells are considered row/column 0/8 for the purpose of indexing.
Slowscrapers: Each outside cell that is clued or indexed must be filled with a digit. That digit counts how many values are 'seen' looking into the row/column. A value is seen if it is not smaller than all values before it. The value of a cell is the sum of its digit(s).
Given Sum: The Slowscrapers in row 6 sum to 10.
Notes: Cells with two digits (S-cells) index twice. 0 or 8 in indexers index outside cells. Values (sum of digits) are only relevant for Slowscrapers. "No repeats in rows/columns" does not apply to outside cells.
Rules
Click on the image to play!

Example

The red cells are "S-cells" which contain two digits. The 02 S-cell in r4c5 indexes 5 into r4c0 and r4c2. The 5 in r4c0 says that 5 of the values in the row (3664289) are "seen".

What Is The Sudoku Twitch Train?

The Sudoku Twitch Train is a raid train on twitch which took place on the beginning of May 2026. 16 streamers are streaming sudoku puzzles (solving and setting) for 2 days. A similar event took place in 2024 and 2025. For more information, click here. This puzzle was set for ChinStrap. Thanks Ratfinkz for organizing this event and coordinating customized puzzles for every streamer.

Solution code: The middle row from left to right, not including outside cells or cells with two digits (S-cells). For the example, this would be 36489.

Last changed on today, 03:47

Solved by Calvinball, Sotehr, ChinStrap, Ratfinkz, SennyK, SKORP17, earthpuzzles
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Comments

today, 17:26 by earthpuzzles
Fantastic setting of schrödinger x squishdoku — each clue well chosen!

today, 06:09 by ChinStrap
Absolute madness, perfectly tailored to my brainworms. I loooooved this. Thank you so much gdc!

today, 04:49 by Ratfinkz
Absolutely beautiful puzzle!

today, 03:49 by Calvinball
Epic things can come in small grids, fantastic puzzle and the perfect one for lord Strap of House Chin.

Difficulty:4
Rating:N/A
Solved:7 times
Observed:1 times
ID:000S8A

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