Arancia MeccanicaA moving bead puzzle with seven colors of beads, and a base that resembles an orange.
Briansk ringsAnother derivative of the hungarian rings produced in the USSR.
KristallThe Tetraminx produced in Riga during the soviet era.
Kristals-MA tetraminx with russian origin with a special spiky shape.
Kvadratura KrugaA puzzle from the soviet era. Its title means "Squaring the circle"
Okki Gem I (aka Alexanders Gem)A sticker variant of the Okki which transforms the puzzle back into a puzzle equivalent to the 2x2x2. Produced in East Germany but often customly remade.