The classic puzzle game, invented by evil communists and repeatedly copied until there was nothing left to clone, is in full breach of copyright owned by The Tetris Company LLC (according to http://en.wikipedia.org/wiki/Tetris). Wow, that first sentence was a bummer! Anyway, though the game cannot legally be named Tetris, I'm not going to correct the source code and thus must "go with it."
Much of the classic Game Boy gameplay is preserved, and with different songs and levels there's plenty to do! Go for the highest score of 200k to unlock the final bonus song!