From the instruction booklet:
"The Tricky triangle: This is just the thing for those who don't give in easily! This is a game for 1-2 players, either as a team or in competition. In all there are 25 geometrical figures which have to be assembled, and in each case the same basic forms are used. This is a real intelligence test, a must when parties grow dull. A fascinating game for adults: Intelligence in colored pieces.