mechanical-puzzles has 7 questions. Its wiki says:
Puzzles that are physically made and have some sort of mechanism for turning or moving them, such as Rubik's Cubes or trick boxes.
twisty-puzzles has 4 questions. Its wiki says:
The twisty-puzzles tag is for all questions related to solving or discussing Rubik's Cube related puzzles.
Do we really need them both, or can one be made a synonym of the other?