is an improved version of the popular web game, Lines.  To score, you must swap adjacent pairs of images to make three (or more) in a row or column.  These objects then disappear and are replaced by new objects falling down from the top.
When you reach the required points for each level, you advance to the next.  If you run out of moves, you can use a free shuffle.  But be careful because you only have a few.

Seven levels to play.

Download here (right click, save as):
Regular File:  triplets.exe     Zipped Version: