Tussen Lijnen Sudoku
4
6
9
1
4
7
5
7
9
1
3
2
6
1
5
4
3
1
6
9
7
1
6
4
3
3
5
8
4
7
1
5
7
8
6
8
7
3
Fouten
0/3
Score
-
Tijd
00:00
Voortgang0%
Gemakkelijk · Tussen Lijnen
Wissel moeilijkheidsgraad hierboven ↑
Hoe Between Lines Sudoku te spelen
Standaard Sudoku-regels zijn van toepassing. Elke lijn heeft twee cirkeluiteinden. Alle cijfers langs de lijn (exclusief de cirkels) moeten strikt tussen de twee eindpuntwaarden liggen.
Volledige gids →
Digits op een line moeten strikt tussen de twee endpoint values vallen
Tussen Lijnen Sudoku Gemakkelijk
Tussen Lijnen Sudoku Gemiddeld
Tussen Lijnen Sudoku Moeilijk
Tussen Lijnen Sudoku Expert
Wat is Tussen Lijnen Sudoku?
Tussen Lijnen Sudoku tekent lijnen met cirkelvormige eindpunten. Elk cijfer langs de lijn (exclusief de eindpunten zelf) moet strikt groter zijn dan het kleinere eindpunt en strikt kleiner dan het grotere eindpunt. Als de eindpunten 2 en 8 zijn, moet elke middelste cel op de lijn een van 3, 4, 5, 6 of 7 zijn. Hoe dichter de eindpunten bij elkaar in waarde liggen, hoe meer beperkt de middelste cellen zijn.
In één oogopslag
| Beperkingstype | Lijnbeperkingen |
| Typische gegeven cijfers | 20–28 |
| Moeilijkheidsbeoordeling | ★★★☆☆ 3/5 |
| Gem. oplossingstijd — Gemakkelijk | 8 min |
| Gem. oplossingstijd — Gemiddeld | 18 min |
| Gem. oplossingstijd — Moeilijk | 36 min |
| Gem. oplossingstijd — Expert | 64 min |
Hoe Tussen Lijnen Sudoku op te lossen
| Techniek | Wat het doet | Niveau |
|---|---|---|
| Endpoint Gap Analysis | The gap between endpoint values must be large enough to accommodate all middle cells. If endpoints are 2 and 8, middle cells must come from {3,4,5,6,7}. | Beginner |
| Endpoint Ordering | The endpoint values have no fixed order — the constraint is that all middle cells are strictly between the minimum and maximum endpoint. | Beginner |
| Tight Endpoint Constraint | If endpoints would be consecutive (e.g., 3 and 4), no middle cell could satisfy the strict inequalities — use this to force endpoints apart. | Gevorderd |
| Between-Line–Box Interaction | All middle cells sharing a box must satisfy the between constraint. Use the box to eliminate candidates outside the valid range. | Gevorderd |
Gemiddelde Oplossingstijden
Gemakkelijk
8 min
Gemiddeld
18 min
Moeilijk
36 min
Expert
64 min
Veelgestelde Vragen
Wat is Between Lines Sudoku?
Between Lines Sudoku is a variant where lines with circular endpoints are drawn on the grid. Every digit along a line (excluding the endpoint circles) must be strictly between the two endpoint values. The endpoints themselves are placed during solving — only the line positions are given.
How do I read the between-line clues?
The two circles at the ends of each line are the boundary values. Every cell between them must be strictly greater than the smaller endpoint and strictly less than the larger one. You deduce which endpoint is larger as part of the solve.
Can the endpoints be any digits?
Yes. Endpoint circles are not pre-filled — you place digits in them during solving. The only rule is that every cell along the line (excluding endpoints) must sit strictly between whatever ends up in the two circles.
What is the best strategy for Between Lines Sudoku?
Look for short between-lines — a single cell between two endpoints is tightly constrained. Combined with row, column, and box rules, the valid range for that cell is often very small. Also look for lines where available candidates in a given row or column form a narrow range.
Is Between Lines Sudoku hard to learn?
The concept is straightforward but the deductions require careful range analysis. Tracking the minimum and maximum possible values for each endpoint and inferring the valid range for in-between cells is the core skill. Easy puzzles make this very accessible.
How long does Between Lines Sudoku take to solve?
Easy puzzles take 8–18 minutes. Medium puzzles run 18–35 minutes. Hard puzzles average 35–65 minutes and expert puzzles can take over 90 minutes. Solve time scales with the number of overlapping lines and the complexity of range interactions.