Chtulhu the Quick wrote:
Tetris is impossible to lose if you know a few simple things about the game, providing you have good concentration
I don't know about this version, but in real tetris, every 20 lines or so you advance a level, and every level moves faster than the last.
In the NES version, at about level 16 the blocks fell practically straight down without enough time to even move them left or right.