Palindrome Sudoku/en

Instructions

Fill the grid with digits 1 to 6 so that each digit appears exactly once in every row, column and outlined area. The first and last, 2nd and 5th.... rows are palindromes, i.e one of them read backwards gives the other. This applies for every following pair, in rows and columns.

History

Invented by Riad Khanmagomedov (Russia).