hiddenpiece

noun
UK /ˈhɪd.ən.piːs/
US /ˈhɪd.ən.piːs/

A hidden piece is a small part of something that is kept out of sight.

The puzzle had a hiddenpiece that only appeared when you tilted it toward the light.


OTHER MEANINGS

2. A secret advantage or bonus kept private until it is useful.

Her fluency in Spanish was a hiddenpiece that helped her win the negotiation.

3. A concealed fragment of a larger object, such as a missing puzzle or game piece.

We searched the carpet for the hiddenpiece that would complete the jigsaw.

4. A private detail of a story or plan that is revealed later.

The final chapter drops a hiddenpiece that changes how you read the whole book.