XV Sudoku
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Fácil · Sudoku XV
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Cómo jugar al Sudoku XV
Se aplican las reglas estándar del Sudoku. X entre dos celdas adyacentes significa que suman 10. V significa que suman 5. Los pares sin marcador tienen garantizado que no suman 10 ni 5.
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X entre celdas significa que suman 10; V significa que suman 5
Qué es XV Sudoku?
XV Sudoku (también llamado Ten-Five Sudoku) coloca marcadores X y V entre celdas adyacentes. Una X significa que las dos celdas suman 10; una V significa que suman 5. Muchos puzzles XV usan la restricción negativa: la ausencia de un marcador garantiza que el par no suma ni 10 ni 5. Combinado con el Sudoku estándar, esto proporciona restricciones muy ajustadas en toda la cuadrícula.
De un Vistazo
| Tipo de restricción | Relaciones de Celdas |
| Valores dados típicos | 18–24 |
| Valoración de dificultad | ★★★☆☆ 3/5 |
| Tiempo de resolución prom. — Fácil | 8 min |
| Tiempo de resolución prom. — Medio | 18 min |
| Tiempo de resolución prom. — Difícil | 35 min |
| Tiempo de resolución prom. — Experto | 62 min |
Cómo resolver XV Sudoku
| Técnica | Qué hace | Nivel |
|---|---|---|
| Negative Constraint | Where no X or V appears between adjacent cells, their sum is neither 10 nor 5. This eliminates (1,9), (2,8), (3,7), (4,6) for X and (1,4), (2,3) for V. | Avanzado |
| Sum Pair Enumeration | List all digit pairs that sum to 10 (for X) or 5 (for V), then use row/column placement to identify which pair must occupy each marked pair. | Avanzado |
| Marker Chain Logic | Multiple consecutive X and V markers in a row form a sum chain — enumerate valid assignments for the entire chain simultaneously. | Avanzado |
| Box X-Interaction | An X pair forces both digits into specific positions within their shared box, constraining all remaining cells of that box. | Avanzado |
Tiempos de Resolución Promedio
Fácil
8 minutos
Medio
18 minutos
Difícil
35 minutos
Experto
62 minutos
Preguntas frecuentes
¿Qué es XV Sudoku?
XV Sudoku is a variant where X and V symbols appear between adjacent cells. An X marks two cells that sum to 10. A V marks two cells that sum to 5. Standard Sudoku rules apply, and — critically — all X and V relationships are fully marked: if there is no symbol between two adjacent cells, those cells are guaranteed not to sum to either 10 or 5.
What pairs sum to 10 (X)?
The valid X pairs are: 1&9, 2&8, 3&7, 4&6. Note that 5&5 sums to 10 but standard Sudoku uniqueness rules prevent two 5s from being adjacent in most cases. The X constraint immediately limits each marked cell to a small set of candidates.
What pairs sum to 5 (V)?
The valid V pairs are: 1&4, 2&3. Only four digits can ever appear in a V cell: 1, 2, 3, or 4. This makes V markers particularly powerful for restricting candidates in the lower half of the digit range.
How does the no-symbol constraint work?
All X and V relationships are shown — if two adjacent cells have no symbol, their sum is guaranteed to be neither 5 nor 10. This negative constraint eliminates candidate pairs from unmarked cell boundaries and is often as useful as the explicit symbols.
Is XV Sudoku hard to learn?
The rules are simple to memorise. The challenge is applying both the positive (X, V) and negative (no symbol) constraints simultaneously across the entire grid. Easy puzzles are very accessible; expert puzzles require exhaustive tracking of all adjacent-cell relationships.
How long does XV 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 no-symbol negative constraint is the most time-consuming to apply systematically across a densely marked grid.