Stack Up

A good alternate title for this one would be Rows – not the kind you have when your wife finds lipstick on your shirt collar, but as an equivalent of Columns. The gameplay is essentially the same – groups of 3 variably-colored blocks fall towards the bottom of a 6×18 grid, and you must arrange them into groups of 3 of the same colour – except that the blocks are grouped horizontally rather than vertically.