Play Tetris Online: A Step-by-Step Guide

Visit a website that offers online Tetris games, such as 'tetris.com' or 'tetrisfriends.com'.

Sign up for an account. You will need to provide information such as your name, age, and e-mail address.

Once you have logged in, you can select which type of game you want to play.

After selecting a game type, you will be presented with the game board and the pieces you need to use to make lines.

Use your keyboard or mouse to move the pieces and try to form lines. When you have cleared a line, it will disappear from the board.

The game is over when your board is full and you can no longer make any moves.