Visit the discussion blog: http://googlepuzzles.blogspot.com/
Puzzles: http://solvepuzzles.googlepages.com/puzzle
Solve Old Puzzles: http://solvepuzzles.googlepages.com/puzzle

Answers to Puzzle 12:
What is puzzle 12? Link Below
Here is the official hidden rule for the Bolt Swap puzzle.

A king has four "activation squares": up-and-to-the-right, right, left, down-and-to-the-left. A king can only move if at least one of its "activation squares" is occupied by another king of the same color.
Minimum moves: 15

(Answers provided by CoreyPlover)

http://solvepuzzles.googlepages.com/puzzle12