40 levels with 3D Mahjong in Black and White. Match 2 of the same free cubes: 1 white cube and 1 black cube. Cubes are free if they have two free adjacent sides. You can rotate your view.
Try to reach your supervisor. Click on a connected group of 3 or more items to remove the items just before your worker. Move your worker closer to the supervisor and again remove blocking items.