Disentanglement puzzle

One of these two tasks might be much more challenging than the other. Nevertheless we will call both types of puzzles 'disentanglement puzzles'.

Categories of disentanglement puzzles:

• burr puzzles . More or less compact shapes that have to be disassembled.
• rattle puzzles . These are burr-type puzzles with loose-fitting pieces.
• ball-in-cage puzzles[?] . These are burr-type puzzles which release a ball when disassembled.
• wire puzzles . Made from several interlinked pieces of stiff wire.
• wire-and-string puzzles . Made from wire, string and maybe other attachments.
• plate-and-ring puzzles . Plate with holes or indentations plus ring.
• others[?]