Like Minesweeper, try to reveal the whole board without flipping certain
tiles. In this game:
upward pointing triangles are always primary colors, and
downward pointed triangles determine their color from the triangles
which share an edge
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Red and yellow make orange. Blue and yellow make
green. Red and blue make purple.
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But, all three as neighbors to a downward
pointed triangle makes brown - a Tertiary color.
Goal: Reveal all triangles
except the Teriary ones, and you win. Alternate selecting up & down
pointing triangles. In the endgame, when the only downward triangles remaining
are Tertiary, reveal all upward triangles to stop the clock.