INTERLOCKING Puzzles (INT) interlock in three dimensions,
i.e. one or more pieces hold the rest together, or the pieces are mutually self-sustaining.
Many clip-together puzzles are "non-interlocking".
Polyhedral Puzzles by Stewart Coffin, Bill Cutler, Gaby Games.
Swiss Cow by Spiel Naef. Japanese Gate, Pagoda, Tank, Crab and Rabbit by Yamanaka Kumiki Works. Mini Zoraida by Berrocal. Hamburger by Mag-Nif. Bell Keychaind, ...