Trick-knife puzzles usually employ a folding knife with unusual or hidden mechanics that stops it from opening. Such a knife is called a trick-knife[?].
Trick-knives have a long history and are among the oldest puzzles known.
Originally the secret mechanism might have been designed to make sure that the knife was not immediately useful when taken from the owner in a fight.
All Wikipedia text
is available under the
terms of the GNU Free Documentation License
Search Encyclopedia
Search over one million articles, find something about almost anything!