3x6x6 Linked Sudoku (Daily Sudoku League #123) (MSS #48)

Sudoku Mahabharat 2015 Final has 3rd Round named Arjuna which was having Relay Sudoku. It consists of 3 6x6 Sudoku. One has to solve 1st Sudoku and then has to transfer some of the digits to the next Sudoku and then after solving 2nd Sudoku, one has to transfer some digits from 2nd Sudoku to 3rd Sudoku. After transfer of these numbers only can make this 3rd Sudoku solve fully. I was trying to create similar Relay Sudoku, just to get the feel of this round when I created this 3x6x6 Linked Sudoku. The difference between the Relay Sudoku and this Linked Sudoku is that in Relay Sudoku puzzles are solvable independently in sequence. However in Linked Sudoku, one has to move backwards and forward to solve all the given set of Sudoku together.
I am posting this 3x6x6 Linked Sudoku, as 123rd Sudoku in Daily Sudoku League and 48th Sudoku in Mini Sudoku Series.

Rules of 3x6x6 Linked Sudoku

Mini Classic(6x6) Sudoku Rules on each of the Sudoku. Three standard Mini Sudoku puzzles are linked to each other. The shaded cells must contain the same digit in each of the grids.