Online since 2002. The most comprehensive site for all around twisty puzzles with 11842 puzzles, 5180 members and 416448 posts to 37737 topics.

Twistypedia
From Twistypedia

Connecting two or more twisty puzzles through each other, see example below. Fusing two identical puzzles is called siamese.

Fused Triple Petaminxes

join » login » Community