Proportional MixupA shape variant of the Mixup Cube. It was designed to have proportional "cubies".
Proportional OhA proportional version of the Oh Cube, which is an earlier design of the same designer.
Pseudo ChopA minimalistic puzzle that uses two different axis but is still doctrinaire.
Quartolabacus A newly-designed Astrolabacus with four channels of beads instead of two.
Quasi TwistA shape variant of Rocket Twist that demonstrates the pentagonal symmetries of every turn.
RainbowlabacusA small but symmetry-breaking modification of the Astrolabacus.
Real 6x6x6A 6x6x6 which requires the inner 4x4x4 to be solved as well.
Redi CubeA twisty puzzle cube that turns around its corners. A faceless Compy Cube.
Rhomdo TransformerA hybrid puzzle but not in the classical meaning of the word. It takes an awkward axis system and makes it more awkward.
Rob's PyraminxA Halpern-Meier-Tetrahedron (aka Jings Pyraminx) without edges.
Rocket StarThe Rocket Twist with a five-fold symmetry instead of a three-fold symmetry.