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

Moving: Marbles
IQ BallA double sided version of butterfly with a new move to exchange marbles.
Kosmicheski OrbityTwo intersecting rings of marbles but with four junctions at which the pieces can change between the rings.

Magic 8Group the three colours to solve this puzzle.
Magic BagelFour rings of marbles with two cylinders synchronized by gears.
Magic BeanA version of the Orb that is even smaller than the Copper Orb.

MastrolabacusA bigger version of Astrolabacus with five grooves. Maybe the first puzzle with moving marbles that jumbles.
Midi Barrel (Japanese)A japanese version of the wellknown Ten Billion Barrel
Möbius LoopOne (!) ring of marbles plus one rotation.

Moeraki Games Nr. 3One of a series of Moving marbles games.
Moeraki Games Nr. 4One of a series of Moving marbles games.
Monroe's MarblesMove the marbles from one column to the next by tilting and turning. Try to get each column a single colour.

Muschel DrehholzFour rings of six balls each.
Olympic RingsFive intersecting rings of marbles in a solid body.
One At A TimeTwo intersecting rings with three non-intersecting circles connected by gears.

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