An octave magic cube has a spherical center core with square slider plates mounted at end of a six-arm cross center piece. A pattern of space channel is formed between the slider plates. Seven movable cubic block pieces having a triangular retainer plate mounted at the center of a partial spherical depression formed in one of its corners. The movable cubic block pieces are mounted to the core by slidably engaging the retainer plate with the space channel of the core. An eighth cubic block piece has a mounting plate with a clover leaf pattern is snap-mounted to the space channel of the core at the remaining position of the cube after the seven movable cubic block pieces have been mounted to the core.