Congruent faces . . . 6
Edges . . . . . 12
Vertices . . . 8
Bases . . . I'm not exactly sure what a 'base' is. If it's just a flat area that the cube could sit on without falling over, then there are 6 because it could sit on ANY face and not fall over. But only one at a time.
The faces are all . . . squares.
