TANGLEMENT PUZZLES (TNG) have parts that must be linked or unlinked. The linked parts, which may be flexible, have significant freedom of movement in relation to each other, unlike the parts of an interlocking puzzle.

Mickey Mouse by Tad Muroi, Keys from Japan 1980s based on Victorian Keys improved and modified by Nob Yoshigahara

"Radio" by James Dalgety. "Rock" by Jean Claude Constantine