Stack Up is an awesome puzzle game on www.flash-games.net in which your objective is to adjust the falling tiles to make them into matches of three or more same colored patterns in a line horizontally, vertically or diagonally. Use up and down arrow keys to change the position and the left and right keys to move it left and right. The next falling type of the combination is shown on the left side of the game screen. The more you removed the same patterned tiles, the higher score you will get. Watch out, as you progressed further, the levels will get harder. Go ahead and explore various challenging levels... Good luck and have fun!