Play Tetris Online: A Step-by-Step Guide

Visit a website such as Tetris.com, Tetris Friends, Tetris Party, or Tetris Flash.

Create an account if necessary.

Select a game mode.

Use the arrow keys on your keyboard to move and rotate falling blocks.

Try to create complete horizontal lines to clear them from the board.

When the board is filled up, the game is over.

Play against other players online if the game allows it.