You can't review Tetris. It's like reviewing . . . . water. A simple puzzle game, that still sets the standard that all other puzzle games are judged against.
In a random order, one of seven differently shaped blocks falls slowly down the screen and it's the job of the played to create a complete horizontal line from one edge of the screen to the other. Once the line is created, it disappears. Points are scored for lines created and as the score increase so too does the pace that the blocks drop. The game is over when the collection of blocks reached the top of the screen.
Graphically it's not up to much, but nor does it have to be. The music varies based on which version of the game you are playing - usually some adaptation of a piece of classical music - though special mention must go to the iconic tune that Hirozaku Tanaka created for the Gameboy version. Those are just dressing though for the gameplay, which is amongst the best of any game, ever. You understand it immediately, it's eternally addictive and each game goes from placid organisation to manic, frantic choices in what is one of the most stressful gaming moments possible.
There is little more to be said. Just a wonderful game.