Here's some near useless info on Tetris that I have observed...
Wait for it... ;)
OK, I'm pretty sure the "Tetris" move is when you slot the straight piece in, to remove "4 Lines" in 1 hit... Not a very hard move...
The hardest move is to have "no blocks" on screen... It is extremely rare, and difficult to achieve!... Clear all lines, and all blocks...
Yes, I prequalified it, by saying it is a stupid observation! LoL! 
BORING afternoon at work, get me out of here!
Haha!
I work hard! Once in a while a steam train can run out of steam too though! Or the train can be awaiting a coal delivery, so it can continue it's journey!
So ease up "Rails"!
