The MonsterGo Mirror Cube is Gan's budget line mirror cube, it features the same mechanism as their Gan Mirror Cube but without the magnets, it probably performs better than the QiYi or Meilong Mirror Cubes but is £5 more expensive. The Mirror Cube can be solved just like an ordinary 3x3x3 but you focus on the height of the pieces instead of the colours.

You can buy it here