Terra Incognita (with ChinStrap)
(Published on 4. July 2025, 16:11 by sujoyku)
- RBC 1-6 sudoku: Fill the grid with the digits from 1 to 6 and the letters R, B and C such that each row, column and 3x3 box/region contains each symbol once. If a cell contains an R, B, or C its value is the cell's row number (R), box number (B) or column number (C). Rows, columns and boxes are numbered from top to bottom and left to right.
- Index Lines: Each turquoise line is an Index Line, i.e. the value of the Nth cell along such a line (starting from the diamond) indicates the position along the line where the value N appears. If a diamond has multiple lines, each line is treated separately. For example, if a diamond cell has a value of 3, the third cell along that line must have a value of 1. (If allowed by other rules, symbols may repeat along a line.)
- Kropki: Cells joined by a white dot have consecutive values. (Not all dots are given.)
Here you can solve the puzzle online:
If you like to solve on mobile, here is a link where A can be entered instead of R:
Solution code: Row 4 from left to right with 1-6 and RBC (9 digits in total)
Comments
on 8. July 2025, 06:37 by Crusader175
Awesome!
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Thank you, Crusader175!
Kind regards, sujoyku
on 6. July 2025, 23:02 by Exigus
That was just beautiful. Hard but still felt really smooth. Thanks!
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You are much welcome, Exigus, thank you for your comment! We are glad that you enjoyed a smooth solve.
Kind regards, sujoyku
on 6. July 2025, 17:40 by jseng
One of the most amazing sudoku I have solved which twisted and stretch my brain. I have to restarted at least 3 times, but all fun!
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Congratulations on the solve and thank you for your comment, jseng! We are glad that you had a fun solve.
Kind regards, sujoyku
on 5. July 2025, 21:16 by marcmees
There always seem more possibilities than expected. Hard but rewarding solve. Thanks
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Thank you for your comment, marcmees! We are glad that you found the solve to be rewarding.
Kind regards, sujoyku
on 5. July 2025, 13:07 by applesauce
Made my brain hurt in the best way. Really interesting and creative!
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Thank you for your comment, applesauce! We are glad that you found the puzzle to be interesting.
Kind regards, sujoyku
on 5. July 2025, 10:58 by zeniko
What a mind bender! This might have been easier with a full keyboard, still I appreciate the mobile link for solving this beauty on the go. Thanks for sharing.
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You are much welcome, zeniko, thank you for commenting! We are glad that the link for mobile proved useful and you had a fun solve.
Kind regards, sujoyku
on 5. July 2025, 02:35 by MSDOS
Very wonderful and challenging puzzle! A few "of course" easy misses and scanning issues, but really loved how it all came together!
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Thank you for your comment, MSDOS! We are glad that you liked how the puzzle unfolded.
Kind regards, sujoyku
on 5. July 2025, 01:38 by Voidslime
This is such a cool puzzle. It felt so impossible at first but every time i resorted to filling in possible pencil mark trees, I’d realize something new that elegantly and satisfyingly made progress.
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Thank you for your comment, Voidslime! It is great to hear that you had such a nice solving experience.
Kind regards, sujoyku
on 4. July 2025, 23:27 by rubencubed
SO good!! Though I typed "5" instead of "R" more times than I care to admit, at no point did I find the logical flow to stall :D
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Thank you for your kind words, rubencubed! We are glad that you enjoyed the puzzle.
Kind regards, sujoyku
on 4. July 2025, 18:35 by Franjo
Wow! Ich hatte zwar ein paar Probleme mit den drei Buchstaben, fand die Beschäftigung damit aber auch kolossal interessant! Vielen herzlichen Dank für das faszinierende Puzzle.
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Toll, dass es Dir gefallen hat, Franjo, vielen Dank für deinen Kommentar! Die Variante kann anfangs etwas verwirrend sein, aber es freut uns, dass Du Spaß hattest, Dich reinzufuchsen.
Herzliche Grüße, sujoyku
on 4. July 2025, 17:38 by mellowrobinson
Mind bending like a spoon in The Matrix. Beautiful puzzle!
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Thank you, mellowrobinson! We are glad that you enjoyed it.
Kind regards, sujoyku
on 4. July 2025, 16:57 by sujoyku
fixed the wording of rules in the solving link for mobile, no changes to the content of the puzzle
