Thermo Sudoku
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Tijd
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Gemakkelijk · Thermo Sudoku
Wissel moeilijkheidsgraad hierboven ↑
Hoe Thermo Sudoku te spelen
Standaard Sudoku-regels zijn van toepassing. Extra regel: cijfers langs elke grijze thermometer moeten strikt toenemen van de bol (cirkeluiteinde) naar de punt. Een 3-cellige thermo kan 2,5,8 of 1,4,9 zijn, maar niet 3,3,7 of 5,4,8.
Volledige gids →
Digits moeten strikt toenemen langs thermometer shapes
Thermo Sudoku Gemakkelijk
Thermo Sudoku Gemiddeld
Thermo Sudoku Moeilijk
Thermo Sudoku Expert
Wat is Thermo Sudoku?
Thermo Sudoku legt thermometer vormen op het grid. Elke thermometer heeft een bulb (cirkel) aan het ene uiteinde en een tip aan het andere. De digits langs elke thermometer moeten strikt toenemen van de bulb naar de tip. Gecombineerd met standaard Sudoku constraints creëert dit krachtige chains of deductions — wetende dat de bulb ten minste 1 is en de tip ten hoogste 9, kun je het bereik van geldige waarden voor elke cell op de thermometer berekenen op basis van zijn positie.
In één oogopslag
| Beperkingstype | Lijnbeperkingen |
| Typische gegeven cijfers | 20–28 |
| Moeilijkheidsbeoordeling | ★★★★☆ 4/5 |
| Gem. oplossingstijd — Gemakkelijk | 10 min |
| Gem. oplossingstijd — Gemiddeld | 22 min |
| Gem. oplossingstijd — Moeilijk | 45 min |
| Gem. oplossingstijd — Expert | 75 min |
Hoe Thermo Sudoku op te lossen
| Techniek | Wat het doet | Niveau |
|---|---|---|
| Range Restriction from Length | A thermometer with N cells must use N strictly increasing distinct values. The bulb is at least 1 and the tip is at most 9, giving a calculable valid range for each cell. | Beginner |
| Minimum/Maximum Bounding | The bulb value is ≤ 9 − (N − 1). The tip value is ≥ N. Apply these bounds immediately to prune all thermometer candidates. | Beginner |
| Overlapping Thermometer Deduction | Two thermometers sharing a cell give tighter combined bounds than either alone. | Gevorderd |
| Forcing Chains via Thermometers | When a value is forced into a thermometer cell, all cells closer to the bulb must be smaller and all closer to the tip must be larger. | Gevorderd |
| Short vs. Long Thermometers | A 2-cell thermometer is simply a greater-than relationship. A 9-cell thermometer forces exactly 1–9 in order. | Gevorderd |
Gemiddelde Oplossingstijden
Gemakkelijk
10 min
Gemiddeld
22 min
Moeilijk
45 min
Expert
75 min
Veelgestelde Vragen
Wat is Thermo Sudoku?
Thermo Sudoku is a variant where thermometer shapes are drawn on the grid. Each thermometer has a bulb (rounded end) and extends through several cells toward a tip. The digits must strictly increase from the bulb to the tip — so every cell along a thermometer must hold a larger digit than the one before it.
Hoe lees ik de thermometeraanwijzingen?
The bulb is the starting point and must hold the smallest digit on that thermometer. Each subsequent cell must be strictly larger. For example, a 3-cell thermometer starting at the bulb means the bulb holds at most 7 (since two larger digits must follow). A 5-cell thermometer means the bulb holds at most 5.
Can digits repeat on a thermometer?
No. Because digits must strictly increase, no digit can appear twice on the same thermometer. A 4-cell thermometer uses four different increasing digits. Combined with standard Sudoku uniqueness rules, thermometers create very tight constraints on every cell they pass through.
Is Thermo Sudoku hard to learn?
The core rule is simple — digits increase from bulb to tip. Beginners can start solving after understanding just that one constraint. What makes higher difficulties challenging is tracking minimum and maximum values for each thermometer cell simultaneously across many overlapping thermometers.
What is the best first move in Thermo Sudoku?
Look for long thermometers. A 7-cell thermometer can only start at 1 and end at 7, 8, or 9 — drastically limiting all seven cells. Also check for thermometers where the bulb or tip overlaps with a constrained row, column, or box, as this often pins the starting digit immediately.
How long does Thermo Sudoku take to solve?
Easy puzzles take 8–15 minutes. Medium puzzles typically run 15–30 minutes. Hard puzzles average 35–60 minutes and expert puzzles can exceed 90 minutes. The difficulty scales sharply as thermometer lengths decrease and the number of simultaneously active constraints increases.