You have to direct the falling blocks to complete rows with no spaces. Then, the completed rows will be cleared and any block above it will fall down.
You can save your progress and resume it later.
Samsung Galaxy Store: Falling Blocks: Block Puzzle
There are 4 buttons at the bottom right of the screen. The right button is to direct the block to the right. The left button is to direct the block to the left. The bottom button is to direct the block to the bottom. The top button is to rotate the block by 90 degrees.
Play, enjoy and have fun !