Online since 2002. The most comprehensive site for all around twisty puzzles.

Dmitry Andreev
Plectrum DuplexThree circles with six tiles. Duplicated on two sides with one special move to exchange between the two sides.
Pleione2 6-10Two circles rotating in six and ten steps.
Pleione2 6-6-10A direct successor to the Pleione2 6-10, with one additional circle.

Pleione49A large circle rotating in six steps and a small circle rotating in five steps.
Pleione56A large circle rotating in five steps and a small circle rotating in six steps.
Pleione65A large circle rotating in six steps and a small circle rotating in five steps.

Pluton's EnigmaEngel's Enigma with two sides partially connected with a single piece.
Plutoscope 3A variant of the first Plutoscope (5) with three circles.
Plutoscope 4A variant of the first Plutoscope (5.1) with four circles.

Plutoscope 4-2.234The four circled variant of Plutoscope with a new pattern.
Plutoscope 5Five intersecting circles arranged around a rounded pentagon in the center.
ProcyonTwo intersecting circles rotatable in five steps of unequal angle.

RigelTwo intersecting circles but with two concentric circles of pieces per half.
Rigel2A direct successor of Rigel from the same designer.
Rigel3A direct successor of Rigel from the same designer.


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