Drop!

Drop! is a puzzle game similar to Tetris. Marbles (known as "Drops") are continually, um, dropping from the top of the screen, and the player controls a "switch frame" which can horizontally switch the position of two neighboring Drops (or switch the position of a Drop and an empty space). The player's goal is to form rows or columns that consist of three or more Drops of the same color - then the row or column will disappear and score will be increased.