Countdown (FoW, Index Lines)
(Published on 25. June 2026, 19:22 by 72kchunshuai)
Just another idea I wanted to try. My friends say I've lost my touch at judging difficulty. This is 2* according to testers.
Rules:
- Normal Sudoku rules apply: Place the digits 1–9 once each in every row, column, and 3x3 box.
- Dynamic Fog: The grid is partially covered by fog and correctly placing digits may reveal more clues. No guessing is required or allowed.
- Index Lines:
- On a teal index line, the digit in the Nth cell along the line (starting from the diamond) indicates the position along the line where the digit N appears. Eg: 3214 would be a valid line; the 1st digit, 3, indicates that the 3rd digit is a 1, and so on.
- Index lines only move orthogonally between centers of cells and don't branch or overlap.
- Local Constraints: Digits along a black dot are in a ratio of 1:2. Digits along a yellow dot are not consecutive. Not all possible dots are given.
Solution code: Row 9 of course, from left to right, nine digits in total.
Solved by DylanRay, jalebc, SKORP17, maniacaljackal, sarabtx, Fisherman, lancer102rus, meloettaHD, killje, Fizz, Hiku, Sushila, kublai, Joven, plinke, by81996672, OdioGenerisHumani, Ftown778, kehan628, ... belnovic, abadx, Crul, sigge, shifman23, 3ColorTheorem, josh_johnson, illegel, Zzzzz..., Toppastala, Lithium-Ion, ravan, Galc127, ole-1995a, SixDogs, mathhead, jinkela114514, Swiddow, croo377
Comments
on 26. June 2026, 18:01 by abadx
Nice puzzle. I like index lines, so on the top half of 2* for me. The last third of the puzzle was a bit dissapointing to me because the first two thirds solve path was astounding. Thanks for setting
