Trading Places
(Published on 21. January 2024, 04:54 by Kafkapharnaum)
Below the main puzzle, you will find warmup puzzles designed to help cut most of the learning curve for both rulesets. I hope you enjoy!
SOLVING LINKS (with tracking cells – no solution check)
Solve on the CTC app
Solve on Penpa
RULES
DOPPELGANGER
– Every row, column, and box contains the digit 0 always, as well as eight out of the nine digits from 1 to 9 (ie, it's missing one digit that is not 0)
– No two row, no two column, and no two box may be missing the same digit
– For each 0 in the grid, the digits missing in its row, its column, and its box must be three different digits (and note that a zero always acts as itself – ie, the lowest possible value – regardless of what digits it's replacing in its box, row and column)
INDEX LINES
– Each cell on an index line has a position number: the square is position 0, and it counts up from there
– If a digit with value V is at position P, then the digit with value P must be at position V
Index Lines – Warmup Puzzles
Solution code: Column 9 (top to bottom)
Comments
on 8. February 2024, 19:09 by The Book Wyrm
Very nice puzzle!
Not too hard either, once you understand the rules (and having done the warmup puzzles).
on 28. January 2024, 22:37 by chrisj50
Another fabulous puzzle! Grateful for the warmup puzzles too which were very helpful. Logical throughout and a really nice solvepath - the two rule sets work beautifully together! This was my first solve of any of your 9x9’s - will have to give the others another look with my newfound confidence!
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Chris! I had no idea you had joined LMD, that is awesome, and thank you so much for claiming your solve on here and for the kind words, I really appreciate it! :D
Regarding the other 9x9's, I think I had already mentioned it over on Discord, but I really feel like Atlantis might be the friendliest of the bunch, despite its wacky ruleset and setup. If you've never player any Coordinate Arrows puzzle, I very much recommend the pack of 16 4x4's by Piatato, Aaronymous and filuta, as well as the original Coordinate Arrows puzzle by Piatato (which was featured on CTC):
https://logic-masters.de/Raetselportal/Raetsel/zeigen.php?id=0009SI
https://logic-masters.de/Raetselportal/Raetsel/zeigen.php?id=00094G
on 28. January 2024, 01:52 by bodemeister
I enjoyed solving your puzzle. Thanks for setting! I love indexing puzzles and have set some myself.
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Oh, I recognize a Nevermore Samurai Initiate -- thank you so much for solving this one as well, much appreciated! I'm taking note of your puzzles, and I'll try and give at least one of your unrated ones a look at some point (I got a few on my backlog, and unfortunately, the fate of my puzzles in general has kind of in turn eroded my puzzle motivation in general... but then again, it's happened before, and I always end up coming back from it, we'll see. In the meantime, thanks so much again!)
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Oh yeah you were the one who designed that puzzle! I'm pretty sure your puzzles are the only two times I've battled the doppelganger ruleset. It's annoyingly fun :D
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Haha, glad to hear that! :D Well if you want to flex on the ruleset at your leisure, there's the 'Discord Line Squadron' pack -- 4x4, 5x5 and 6x6 puzzles. :) In any case, thanks so much again! (and sorry for the delay in replying to your other message, there's only a notification for the first, and I only just now saw this one, by luck)
on 21. January 2024, 17:09 by gfoot
Great puzzle, nice warmup! This ruleset felt much easier than the Buttered Cat Paradox one, but both were great fun to solve!
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Thank you so much for solving this one as well! Indeed, this one was all about presenting the Index Lines ruleset in an approchable and fun Doppelganger puzzle, while Buttered Cat was one of my 'personal challenge' (to myself), which are much more involved solves. Glad you enjoyed both, and thanks for the support! :D
on 21. January 2024, 12:58 by Piatato
Great fun, thanks!
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Thank you so much once again Piatato! Fun is what this one was all about -- thrilled to have your seal of approval on it! :D
