Shuriken Samurai puzzle

Here’s a fun little puzzle.  A say ‘little’ because it revolves around 6×6 grids and some easy logic, although it actually involves 13 of them so it’s not exactly small either.  But I think it looks quite fun – the X shape and the X of givens makes it look a Japanese Shuriken weapon (or perhaps that’s just me), but anyway here it is.

Simply place 1-6 into each row, column and bold-lined 2×3 box of each of the 13 underlying 6×6 Sudoku grids.

Good luck! :)