Rubik Triamid

Patented by Rubik 1991, copyright Matchbox 1990.
(3.5 inches)

When assembled, the four sides of the pyramid are red, blue, yellow, and white. Moves consists of unsnapping a portion rotating it and snapping it back on.

Further reading:
Jaap's Page, from:
McFarren's Page, from:
Rubik HU Patent. from: - patent no. HU207233