Ebook: Adventures in group theory: Rubik's cube, Merlin's machine, and other mathematical toys

Elementary, my dear Watson -- 'And you do addition?' -- Bell ringing and other permutations -- A procession of permutation puzzles -- What's commutative and purple? -- Welcome to the machine -- 'God's algorithm' and graphs -- Symmetry and the Platonic solids -- The illegal cube group -- Words which move -- The (legal) Rubik's cube group -- Squares, two-faces, and other subgroups -- Other Rubik-like puzzle groups -- Crossing the Rubicon -- Some solution strategies -- Coda: Questions and other directions.