Logic Masters Deutschland e.V.

Here's a follow-up to Times Apart, taking the timeline mechanic to a 9x9.

After finishing this, I suggest you give This is how you learn the time war a go!

Rules

Sudoku: Fill the grid with the digits 1-9, so that each digit occurs exactly once in every row, every column and every 3x3 box.

Anti-Kropki: Digits connected by a white dot with a cross are not consecutive.

Space-Time: Each row of the grid represents a slice of time, with the top row as the earliest and the bottom row as the latest. Each column of the grid represents a different location in space.

Timelines: Two time travelling friends, 3 and 7, are jumping forwards and backwards through space-time. The marked columns each represent a traveller's timeline - each digit in the column shows the traveller's age when they appear in that row. The rows below the grid can be used to keep track of each traveller's age in each column, and are not a part of the solution.

Time Jumps: When jumping from one cell to the next (ie. when their age increases by 1), a time traveller may travel as much as they like in time, but only up to 2 columns in space. For example, if a traveller at age 4 is in column 2, their digit must appear in columns 1, 3 or 4 in the row where they are age 5.

Time Sandwiches: Digits outside the grid indicate the sum of the digits that are placed in-between the 3 and 7 in that row or column.

Play in Sudokupad

More Timeline puzzles:

• Times apart
• This is how you learn the time war
• This is how you live the time war

For more puzzles, follow me on Bluesky at @pdyxs.bsky.social