Puzzle Constraints & Rulesets
Index of variant sudoku rules, clue mechanics, and special constraints featured across the catalog.
| Constraint & Definition ⇅ | Videos ▲ | Puzzles ⇅ | First on Channel ⇅ | Most Recent on Channel ⇅ |
|---|---|---|---|---|
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Digital Root
No definition added yet. |
0 | 0 | — | — |
|
Odd Line
No definition added yet. |
1 | 1 |
Snail Mail, Solutions - part 1
Sep 23, 2026
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Snail Mail, Solutions - part 1
Sep 23, 2026
|
|
4x4 Sudoku
No definition added yet. |
1 | 1 |
Tackling the GAS Mountain
Nov 8, 2023
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Tackling the GAS Mountain
Nov 8, 2023
|
|
5x5 Sudoku
No definition added yet. |
1 | 1 |
Tackling the GAS Mountain
Nov 8, 2023
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Tackling the GAS Mountain
Nov 8, 2023
|
|
7x7 Sudoku
No definition added yet. |
1 | 1 |
Tackling the GAS Mountain
Nov 8, 2023
|
Tackling the GAS Mountain
Nov 8, 2023
|
|
Irregular Sudoku
No definition added yet. |
1 | 1 |
Tackling the GAS Mountain
Nov 8, 2023
|
Tackling the GAS Mountain
Nov 8, 2023
|
|
Parity Lines
No definition added yet. |
1 | 1 |
Tackling the GAS Mountain
Nov 8, 2023
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Tackling the GAS Mountain
Nov 8, 2023
|
|
Anti-Consecutive
No definition added yet. |
1 | 1 |
The Miracle Sudoku
May 11, 2020
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The Miracle Sudoku
May 11, 2020
|
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Schrödinger Cells
No definition added yet. |
1 | 1 |
HOW Many Digits in a 4x4 Sudoku?
Aug 25, 2026
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HOW Many Digits in a 4x4 Sudoku?
Aug 25, 2026
|
|
Digits 1-8
No definition added yet. |
1 | 1 |
HOW Many Digits in a 4x4 Sudoku?
Aug 25, 2026
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HOW Many Digits in a 4x4 Sudoku?
Aug 25, 2026
|
|
Sums
No definition added yet. |
1 | 1 |
HOW Many Digits in a 4x4 Sudoku?
Aug 25, 2026
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HOW Many Digits in a 4x4 Sudoku?
Aug 25, 2026
|
|
Diagonal
No definition added yet. |
1 | 1 |
A Sudoku With Only 4 Given Digits?!
Apr 13, 2020
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A Sudoku With Only 4 Given Digits?!
Apr 13, 2020
|
|
Magic Square
The digits in each row, column, and diagonal sum to the same digit. |
1 | 1 |
A Sudoku With Only 4 Given Digits?!
Apr 13, 2020
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A Sudoku With Only 4 Given Digits?!
Apr 13, 2020
|
|
Sissa's Lines
No definition added yet. |
1 | 1 |
Some Special Lines - in London?
Oct 24, 2026
|
Some Special Lines - in London?
Oct 24, 2026
|
|
Greatest Line
No definition added yet. |
1 | 1 |
"The Greatest" Fog Sudoku!
Oct 24, 2026
|
"The Greatest" Fog Sudoku!
Oct 24, 2026
|
|
Perimeter Rotation
1. Move along the perimeter cells in a clockwise direction. From a cell on the perimeter, you move X steps clockwise where X is the digit in that cell. 2. No matter which perimeter cell you start from, you will return to it at some point following rule 1 for every cell you reach. |
1 | 1 |
Phistomefel's New Ring!!
Oct 21, 2026
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Phistomefel's New Ring!!
Oct 21, 2026
|
|
Disjoint Groups
No definition added yet. |
1 | 1 |
The Return Of An Old Friend
Feb 27, 2023
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The Return Of An Old Friend
Feb 27, 2023
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Parity Minesweeper
No definition added yet. |
1 | 1 |
The Return Of An Old Friend
Feb 27, 2023
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The Return Of An Old Friend
Feb 27, 2023
|
|
Between Lines
No definition added yet. |
1 | 1 |
Really Approachable 6x6 Sudoku - Try it!
Feb 12, 2025
|
Really Approachable 6x6 Sudoku - Try it!
Feb 12, 2025
|
|
Self-Counting Circles
A digit inside a circled cell indicates the exact total number of times that specific digit appears in all circled cells throughout the grid. |
1 | 1 |
2024 Arrives With A Sudoku Miracle
Jan 1, 2024
|
2024 Arrives With A Sudoku Miracle
Jan 1, 2024
|
|
Killer
Digits in cages must sum to the corner total without repeats. |
2 | 2 |
No, I am Spartacus
Jun 22, 2022
|
|
|
Liar Clues
No definition added yet. |
2 | 2 |
And Into The Sudoku Hall Of Fame Goes...
May 11, 2023
|
Snail Mail, Solutions - part 1
Sep 23, 2026
|
|
6x6 Sudoku
No definition added yet. |
2 | 2 |
Tackling the GAS Mountain
Nov 8, 2023
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Really Approachable 6x6 Sudoku - Try it!
Feb 12, 2025
|
|
Palindrome Lines
No definition added yet. |
2 | 2 |
Tackling the GAS Mountain
Nov 8, 2023
|
Really Approachable 6x6 Sudoku - Try it!
Feb 12, 2025
|
|
Anti-Knight
No definition added yet. |
2 | 2 |
A Sudoku With Only 4 Given Digits?!
Apr 13, 2020
|
The Miracle Sudoku
May 11, 2020
|
|
Anti-King
No definition added yet. |
2 | 2 |
The Miracle Sudoku
May 11, 2020
|
The Sudoku With Nearly 4 Given Digits?!
Sep 29, 2026
|
|
Sandwich
No definition added yet. |
2 | 2 |
400k Milestone
Oct 2, 2021
|
No, I am Spartacus
Jun 22, 2022
|
|
Little Killer
No definition added yet. |
2 | 2 |
400k Milestone
Oct 2, 2021
|
Really Approachable 6x6 Sudoku - Try it!
Feb 12, 2025
|
|
Odd/Even
No definition added yet. |
3 | 3 |
400k Milestone
Oct 2, 2021
|
Just Dots, but we're going Dotty!
Sep 27, 2026
|
|
Renban Lines
Digits along purple lines form non-repeating consecutive sets in any order. |
3 | 3 |
400k Milestone
Oct 2, 2021
|
Don't Leave me Hanging!
Oct 1, 2026
|
|
Region Sum Lines
No definition added yet. |
3 | 3 |
And Into The Sudoku Hall Of Fame Goes...
May 11, 2023
|
A Viewer Solves Sudoku With Simon: Episode 15
Oct 9, 2026
|
|
Fog Of War
Entering correct digits reveals surrounding hidden cells. |
3 | 3 |
No Complicated Rules So How Can This Solve?
Sep 27, 2026
|
Some Special Lines - in London?
Oct 24, 2026
|
|
Killer Cages
No definition added yet. |
3 | 3 |
400k Milestone
Oct 2, 2021
|
2024 Arrives With A Sudoku Miracle
Jan 1, 2024
|
|
Arrow
Digits along arrows sum to the value in the connected circle. |
4 | 4 |
400k Milestone
Oct 2, 2021
|
The Sudoku With Only 3 Given Numbers?
Oct 23, 2026
|
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Thermo
Digits along thermometers must strictly increase from the bulb. |
6 | 6 |
Glamping it up ... with Sudoku
Mar 9, 2021
|
Phistomefel's New Ring!!
Oct 21, 2026
|
|
German Whispers
Adjacent digits along green lines must differ by at least 5. |
6 | 6 |
400k Milestone
Oct 2, 2021
|
Green Bean Casserole
Oct 23, 2026
|
|
Kropki Dots
No definition added yet. |
7 | 7 |
400k Milestone
Oct 2, 2021
|
"The Greatest" Fog Sudoku!
Oct 24, 2026
|