Solved the Most Difficult Rubik's Cube in the World | Ghost cube - YouTube
Rubik's cube Ghost | Roi du casse-tête
If you think the original Rubik's Cube is hard, try these
Ghost Cube 2x2x4 Crazy 2nd Version Reloaded - Etsy
Amazon.com: CuberSpeed Ghost 3x3 White with Black Sticker Magic Cube 3x3 Ghost White 3x3x3 Speed Cube Black Sticker : Toys & Games
Not sure what to buy next. My favourites are the 3x3, Square-1 and horror. Thinking about a ghost cube, atlas cube (supercube) and maybe an impossible cube or perplexus. Any other recommendations? :