It is a puzzle game that you enjoy erasing the blocks by rotating and fitting.
If you can fill row or column lines by blocks, the blocks are erased.
When you cant fit the block, the game is over.
So the game have no limited time, you can think which way you rotate the block and where you fit it.
When you erase the blocks, you get points as below.
one line : 10 points
two lines : 30 points
three lines : 60 points
four lines : 100 points
five lines : 150 points