Wachtwoord vergeten?
Fri
19
12
25

HSSC - Holiday Season Sudoku Contest

After our succesful 10 year anniversary contest, we now present a sequel: The Holiday Season Sudoku Contest; 8 tough sudoku variants to solve in 2,5 hours.
You can read more about it here on the website via the menu on the right, as well as in the instruction booklet (IB) here.

Extra puzzles with solve hints
Three of the types that are in the contest were also part of the special Sudoku Advent Series, complete with solve hints on the second page of each pdf.
Since not all players might be aware of this Advent calendar, we think it is appropriate to publish these puzzles here too, so everybody has the same information. In the remainder of the Advent calendar, there are no more types that are also in HSSC.

Here are the Advent puzzles:
Day 1 -Position Sums
Day 4 – Sum or Product Frame
Day 14 – Consecutive Sums

More practise puzzles
We enjoyed writing this contest so much that we have a lot of spare puzzles. So for each variant in the contest there will be an extra practise puzzle. They will be published one per day, starting on Tuesday the 16th.

 
Fri
19
12
25

Practise sudoku #4 - Position Sums

Position Sums has become a favorite type for Richard to write. The possibilities for entries in this type seem endless.

 
Thu
18
12
25

Practise sudoku #3 - XV

The negative constraint plays an important role in this XV sudoku!

 
Wed
17
12
25

Practise sudoku #2 - Diagonal

The many given digits in rows 3-7 provide an easy start, but solving gets gradually harder in this Diagonal Sudoku.

 
Tue
16
12
25

Practise sudoku #1 - Mathrax

This Mathrax sudoku was too hard to use in the contest, but since it has everything in it for a good Mathrax sudoku, it is very well suitable as practise material. 🙂 Enjoy!
Sudoku – Mathrax

This practise sudoku was featured on the CtC video channel. You can find the solve video here.

 
Mon
13
10
25

Dutch Championship 2026

Preparations for the 2026 Dutch Championship are underway again! The qualifiers will take place online, from Friday March 6th 2026 at 12:00 (CET) until Monday March 9th 2026 at 11:59 (CET). The live championships will take place on Saturday 2026.. Keep an eye on this website for more information!

 

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