Irregular Diagonal Sudoku
9
4
6
5
6
2
6
8
2
9
1
4
7
4
8
5
4
2
9
6
1
1
3
8
3
5
2
8
1
7
1
8
3
7
6
9
1
3
Fouten
0/3
Score
-
Tijd
00:00
Voortgang0%
Gemakkelijk · Onregelmatige Diagonaal Sudoku
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Hoe Irregular Diagonal Sudoku te spelen
Elke rij, kolom, gekleurde regio en beide hoofddiagonalen (gemarkeerd in amber) moeten elk van 1–9 precies één keer bevatten. Regio's vervangen de standaard 3×3 blokken.
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Combineert jigsaw regio's met hoofddiagonaal beperkingen
Irregular Diagonal Sudoku Gemakkelijk
Irregular Diagonal Sudoku Gemiddeld
Irregular Diagonal Sudoku Moeilijk
Irregular Diagonal Sudoku Expert
Wat is Irregular Diagonal Sudoku?
Irregular Diagonal Sudoku combineert twee varianttypes: de onregelmatige jigsaw-regio's van Jigsaw Sudoku en de diagonale beperkingen van Diagonal Sudoku. Zowel hoofddiagonalen als alle onregelmatige regio's moeten 1–9 bevatten. De combinatie creëert zeer beperkte puzzels met unieke oplossingslogica.
In één oogopslag
| Beperkingstype | Combined: Irregular + Diagonal |
| Typische gegeven cijfers | 22–30 |
| Moeilijkheidsbeoordeling | ★★★★☆ 4/5 |
| Gem. oplossingstijd — Gemakkelijk | 8 min |
| Gem. oplossingstijd — Gemiddeld | 18 min |
| Gem. oplossingstijd — Moeilijk | 35 min |
| Gem. oplossingstijd — Expert | 65 min |
Hoe Irregular Diagonal Sudoku op te lossen
| Techniek | Wat het doet | Niveau |
|---|---|---|
| Map All 29 Units First | You have 9 rows + 9 columns + 9 irregular regions + 2 diagonals = 29 constraint units. Identify all irregular regions and both diagonals before starting. | Beginner |
| Diagonal–Region Intersection | Cells on a diagonal that also sit in the same irregular region create a powerful two-unit intersection — use both constraints simultaneously. | Gevorderd |
| Diagonal Pointing Pairs | If a digit on a diagonal is confined to one irregular region, eliminate it from all other cells of that region. | Gevorderd |
| Region Coloring for Diagonals | Trace which irregular regions each diagonal passes through. Regions with many diagonal cells are the most constrained. | Gevorderd |
| Chain Deduction Across Units | With 29 units, a forced digit in one unit often cascades through 3–4 other units. Track chains carefully to avoid errors. | Gevorderd |
Gemiddelde Oplossingstijden
Gemakkelijk
8 min
Gemiddeld
18 min
Moeilijk
35 min
Expert
65 min
Veelgestelde Vragen
Wat is Irregular Diagonal Sudoku?
Irregular Diagonal Sudoku combines two variants: irregular jigsaw-shaped regions replace the standard 3×3 boxes, and both main diagonals of the 9×9 grid must each contain 1–9 exactly once. Cells on a diagonal therefore belong to four groups: row, column, jigsaw region, and diagonal. It is one of the most constraint-dense variants available.
How many constraint groups does a diagonal cell belong to?
A cell on one of the main diagonals belongs to four groups simultaneously: its row, its column, its jigsaw region, and its diagonal. The centre cell belongs to five groups — both diagonals, plus row, column, and region. This extreme constraint density makes every placement very powerful.
Is Irregular Diagonal Sudoku the hardest variant?
It is among the most constrained variants. The combination of irregular regions and diagonal constraints means almost every cell interacts with an unusually large portion of the grid. Expert puzzles in this variant are among the most demanding logic puzzles on the site.
What order should I tackle the constraints?
Start with the diagonals, since diagonal cells carry the most constraints. Find hidden singles on each diagonal first. Then scan the jigsaw regions, keeping diagonal eliminations active. Update all four constraint groups — row, column, region, diagonal — after every single placement.
Can I use standard Sudoku techniques?
Yes — all standard techniques apply. You simply treat each diagonal as an additional house alongside the nine rows, nine columns, and nine jigsaw regions. The diagonal pointing pair (where a digit in a diagonal is confined to one row or column) is a particularly powerful technique unique to diagonal variants.
How long does Irregular Diagonal Sudoku take to solve?
Easy puzzles take 10–20 minutes. Medium puzzles run 20–40 minutes. Hard puzzles average 40–75 minutes and expert puzzles often exceed 90 minutes. The combined constraint density means that even easy puzzles require tracking four constraint groups simultaneously.