HexicleA custom made variant of Kvadratura kruga with seven circles turned in steps of 60°.
HorVer-PuzzleFour pairwise intersecting plungers with sixteen pieces.
Hungarian GlobeSliding-tile puzzle without gaps. Made in Hungary, originally.
itSimilar to Tsukuda's Square. Marketed in Britain.
ItaliaTwo rotating circles and one plunger make up the italian flag.
KaleidoscopeA moveable plunger intersecting with a rotating circle.
Knight spirit pillA cylinder with 4*8 tiles which can be moved in two completely different ways.
Kvadratura KrugaA puzzle from the soviet era. Its title means "Squaring the circle"