This is the commercial version of the RF-10 Pineapple Secret (twist, black). This is a Secret Box with 18 plate moves and has over 30 steps. The shape of the body is a twisted polyhedron. The movement is different from the RF-9-2. The mechanism was changed only a little from RF-10 just a small adjustment. The degree of difficulty in solving it will be almost the same as theRF-9-2.