Palindroom Sudoku
8
2
3
1
4
1
5
5
4
9
7
6
7
2
2
1
7
9
9
5
1
8
2
7
9
4
5
6
4
1
2
8
6
2
7
1
9
4
Fouten
0/3
Score
-
Tijd
00:00
Voortgang0%
Gemakkelijk · Palindroom Sudoku
Wissel moeilijkheidsgraad hierboven ↑
Hoe Palindrome Sudoku te spelen
Standaard Sudoku-regels zijn van toepassing. Elke grijze lijn is een palindroom - De reeks cijfers leest hetzelfde van beide kanten. Voor een 5-cellige lijn die 3,7,5,7,3 leest, is positie 1 = positie 5 en positie 2 = positie 4.
Volledige gids →
De cijferreeks langs een lijn leest hetzelfde vooruit en achteruit.
Palindroom Sudoku Gemakkelijk
Palindroom Sudoku Gemiddeld
Palindroom Sudoku Moeilijk
Palindroom Sudoku Expert
Wat is Palindroom Sudoku?
Palindrome Sudoku markeert lijnen op het rooster waarvan de cijferreeks een palindroom moet zijn — hetzelfde lezen in beide richtingen. Als een lijn cellen A-B-C-D-E heeft, dan zijn A=E en B=D, terwijl C het centrale cijfer is. Dit creëert paren cellen die dezelfde waarde moeten delen, wat fungeert als krachtige gelijkheidsbeperkingen over het rooster.
In één oogopslag
| Beperkingstype | Lijnbeperkingen |
| Typische gegeven cijfers | 20–28 |
| Moeilijkheidsbeoordeling | ★★★☆☆ 3/5 |
| Gem. oplossingstijd — Gemakkelijk | 7 min |
| Gem. oplossingstijd — Gemiddeld | 16 min |
| Gem. oplossingstijd — Moeilijk | 32 min |
| Gem. oplossingstijd — Expert | 58 min |
Hoe Palindroom Sudoku op te lossen
| Techniek | Wat het doet | Niveau |
|---|---|---|
| Mirror Pair Identification | In a palindrome of length L, cell i and cell L+1−i must share the same digit. Identify all mirror pairs before solving. | Beginner |
| Centre Cell Freedom | The central cell of an odd-length palindrome has no mirror constraint — it is only restricted by standard row/column/box rules. | Beginner |
| Mirror Propagation | Once one cell of a mirror pair is determined, immediately set its partner to the same value. | Gevorderd |
| Multi-Palindrome Intersection | If two palindromes share a cell, that cell must satisfy both palindrome relationships simultaneously. | Gevorderd |
Gemiddelde Oplossingstijden
Gemakkelijk
7 min
Gemiddeld
16 min
Moeilijk
32 min
Expert
58 min
Veelgestelde Vragen
Wat is Palindrome Sudoku?
Palindrome Sudoku is a variant where grey lines are drawn across the grid. Every grey line must read the same forwards and backwards — meaning the first cell mirrors the last, the second mirrors the second-to-last, and so on. Standard Sudoku rules apply throughout.
How does the palindrome constraint work?
For any palindrome line, cell positions are mirrored around the centre. On a 6-cell line, cells 1 and 6 hold the same digit, cells 2 and 5 hold the same digit, and cells 3 and 4 hold the same digit. This immediately links distant parts of the grid — placing a digit at one end fixes the digit at the other end.
Can palindrome lines have repeated digits?
Yes, palindrome lines inherently require digit repetition — each mirrored pair shares the same digit. However, standard Sudoku rules still apply, so a repeated digit must be in different rows, columns, and boxes. Palindrome lines are carefully constructed so that this repetition is always consistent with uniqueness rules.
Is Palindrome Sudoku harder than regular Sudoku?
Easy palindrome puzzles are often easier than classic Sudoku because the mirroring immediately links cells across the board, providing extra deductions. Harder difficulties become quite challenging because you must track mirrored constraints across long lines while maintaining standard Sudoku logic.
What is the best first move in Palindrome Sudoku?
Find palindrome lines where one endpoint cell is already constrained by its row, column, or box. Placing a digit there immediately fixes the mirrored cell at the other end. Also look for odd-length lines — the centre cell has no mirror partner, so it's only constrained by standard Sudoku rules.
How long does Palindrome Sudoku take to solve?
Easy puzzles take 8–15 minutes. Medium puzzles run 15–30 minutes. Hard puzzles average 30–60 minutes and expert puzzles often exceed 90 minutes. The difficulty increases sharply when multiple long palindrome lines overlap across the same region of the grid.