Logic Masters Deutschland e.V.

The 7x7 board is partitioned into three colored regions --- blue, green, and yellow --- with the four corner cells excluded.

---

For colorblind friends:
Blue is central 5×5 square in the middle of the grid.
Green is the top and bottom horizontal strips, each 1×5 in size.
Yellow is the left and right vertical strips, each 5×1 in size.

---

- Fill some of the colored cells with the numbers 1-5 such that each row and column does not contain repeated digit.
In each row there must be exactly one complete set of 1-5 when you consider only the yellow + blue cells.
In each column there must be exactly one complete set of 1-5 when you consider only the green + blue cells.

- Palindrome lines: The sequence of digits along each gray line must form a palindromic number (for example, 1 2 3 1 3 2 1). Every cell that a gray line passes through MUST contain a digit.

- Between Counts: If a yellow cell contains a digit, that digit also tells you how many digits lie between the 1 and the 5 in its row (including both the 1 and 5 themselves).
If a green cell contains a digit, that digit also tells you how many digits lie between the 1 and the 5 in its column (again, including both ends).
See the example below for better illustration to this rule.

- Kropki Pairs: Digits separated by a white dot must be consecutive.

CtC Link
CtC Link without background color