Double-Six Variant for 13 Black Cats

Not everyone has a double-nine set of dominoes, so here's a simple adaptation of 13 Black Cats for the more common double-six set. I suppose it should be called "7 Black Cats."

ALL of the original rules of 13 Black Cats apply except for the following changes:

• Materials: 7 little black cats (or similar super-cute tokens) and a set of double-six dominoes.
• Objective: Move all 7 cats from one side of the domino board to the other.
• Set-up: Drawing dominoes one-by-one, arrange 18 of them into a 4x7 frame.
• Moving Cats: Cats only move through ends when the total number of pips they've moved through and into equals exactly 6 
• The game ends when: all 7 cats have been moved to either end of the dominoes on the opposite side of where they began.