The Engine (Killer sudoku)
(Published on 19. July 2025, 16:54 by sujoyku)
I like to thank him and all other testers and wish you joyful solving!
Rules:
- Normal sudoku rules apply, i.e. each row, column, and 3x3 region has to contain the digits from 1 to 9 once each.
- Killer cages: Digits in a cage do not repeat and must sum to 18.
Here you can solve the puzzle online:
Solution code: Column 2 from top to bottom (9 digits in total)
Comments
on 27. July 2025, 11:42 by Ramez
I can't believe that after using so many colors and letters it actually solves very smoothly. Brilliant setting indeed!
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Thank you for your comment, Ramez! I am glad that you enjoyed the puzzle.
Kind regards, sujoyku
on 25. July 2025, 16:07 by Christounet
Interesting thematic killer! Thanks :)
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You are much welcome, Christounet, thank you for your comment! I am glad you found the puzzle to be interesting.
Kind regards, sujoyku
on 22. July 2025, 13:07 by Exigus
That was hard but very fun. Thanks!
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You are much welcome, Exigus, thank you for your comment! I am glad that you had a fun solve.
Kind regards, sujoyku
on 22. July 2025, 12:40 by Luke7614
This was really tough for me, but I somehow kept at it and the consistent use of colours AND alphabets made it easy
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Thank you for your comment, Luke7614! I also think this is among the 5% hardest puzzles I have ever set. Like you, I also used colours and letters in my own test-solves. :)
I hope you had a fun solving experience.
Kind regards, sujoyku
on 21. July 2025, 02:44 by Agent
Cool puzzle! I really needed to use everything I know about 18 cages.
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Thank you for your comment, Agent! I am glad that you liked this "deep dive into the realm of 18-cages". :)
Kind regards, sujoyku
on 20. July 2025, 21:52 by madhupt
What an absolute killer of a puzzle Sujoy! Not easy but great fun. Had a lovely time colouring the grid and then in one fell swoop filling it all. But it involved cool deductions all the way. Thanks for setting and sharing this!
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You are much welcome, madhupt, thank you for your comment! I am glad you had a fun solve.
Kind regards, sujoyku
on 20. July 2025, 20:10 by Calvinball
I found this to be a rather high octane and very smooth solving experience.
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Thank you for your comment, Calvinball! Don't know about octane, but I am glad you had a smooth solving experience. :)
Kind regards, sujoyku
on 20. July 2025, 19:04 by kamkam
Lovely puzzle ! Some steps were..unusual ;)
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Thank you for your comment, kamkam! Feel free to explain in a hidden comment which steps you were thinking of. :)
I am glad that you enjoyed the puzzle.
Kind regards, sujoyku
on 20. July 2025, 18:26 by cygne
Beautifully set puzzle. The high number of possibilities for 4-cell 18-cages was intimidating, but it's amazing how they came into play
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Thank you for your comment, cygne! I am glad that you enjoyed the puzzle and liked how the 4-cell cages came into play.
Kind regards, sujoyku
on 20. July 2025, 13:03 by Snookerfan
Excellent, thank you!
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You are much welcome, Snookerfan, thank you for your comment! I am glad that you liked the puzzle.
Kind regards, sujoyku
on 20. July 2025, 03:13 by tallcat
A very well constructed puzzle that required careful thought to navigate through. Very enjoyable!
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Thank you for your comment, tallcat! I am glad that you enjoyed the puzzle.
Kind regards, sujoyku
on 20. July 2025, 01:53 by deltameth
Thank you for a very pleasant coloring experience!
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Thank you, deltameth! It is nice to hear you enjoyed the colouring.
Kind regards, sujoyku
on 19. July 2025, 23:21 by giladooshlon
A great complement to the 27 puzzle ;)
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Thank you for your comment, giladooshlon! A complement indeed. :D
Kind regards, sujoyku
on 19. July 2025, 20:27 by Piatato
Lovely!
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Thank you, Piatato! Glad you enjoyed the puzzle.
Kind regards, sujoyku
on 19. July 2025, 20:07 by thoughtbyte
Excellent puzzle, super smooth and fun, thanks!
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Thank you for your comment, thoughtbyte! I am glad that you had a smooth solve.
Kind regards, sujoyku
on 19. July 2025, 17:59 by mellowrobinson
Engine-ious
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Thank you, mellowrobinson! :)
Kind regards, sujoyku
