CONTACK is a game played with 36 triangular pieces. The 3 sides of each triangle are different in colour, and each side has a number from 1 to 10 printed at its edge.
Players try, by matching colour and number, or matching colour and making certain score totals, to play all the triangles from their hand and to make as large a score as possible.
The game was first introduced by the Volume Sprayer Mfg. Co. of Tulsa Oklahoma in early 1939, then published by a number of companies including Parker Brothers later that year. The Volume Sprayer edition has pressed wood pieces and a hexagonal tin-lined box.
Triangular Dominoes (of which Contack is a variant) date back at least to 1886 when published by Frank H. Richards of Troy, New York, for 25¢ or "10 cents silver (for) a cheaper set to learn the game."