Inverse-1The concept of the Square-1 got inverted in this puzzle. A closely relative to the Split 1x2x3 III but with eight segments.
Inverse-2A similar puzzle to the Inverse-1 but the edges on the middle layer were split into two halves.
Jack's CubeA puzzle which combines three different concepts in one puzzle.
Jet 4x4x4The Fisher Axis Cube implemented with a 4x4x4.
Jumble Circle 4x4x4A Crazy 4x4x4 with all corners split into six pieces each thereby allowing 45°-turns on the faces.
Junior Bump CubeA 2x2x2 was "bumped" to make it look like a Mirror Blocks aka Bump Cube.
Keter CubeA deep cut jumbling only puzzle with the axis system of a face turning triangular dipyramid.
Krystian's SkewbA true Mixup Skewb. The slice layers allow moves in steps of 40°.
Kubic TrapThe Kite Trap shape transformed into a cube.
Large Mental BoxA successor to the Mental box, a skewb twisted inside its shape. This one has the shape of a cube.
Lattice OhA Master Dino Cube in shape of a Super X.