AB Series:
ABABA
ABBA
BBABB
AB Squared
Triangular Letters
Now I Know My ABCs
Rules:
Place 5 As and 4 Bs in every row, column, and 3x3 region.
Letters along palindrome (grey) lines must read the same forward and backward.
A appears once at most on (individual) orange lines.
Solution code: Row 2
on 9. January 2026, 13:51 by CHalb
Please add the Sudoku tag.
on 28. November 2025, 11:04 by CHalb
Please add the Sudoku tag.