Play Tetris Online: A Step-by-Step Guide

Visit a popular online gaming website like Kongregate.com, Miniclip.com, or AddictingGames.com.

Use the search bar on the website and type 'Tetris'.

Locate the Tetris game you want to play and click the 'Play' button.

The game will usually have on-screen instructions to help you understand the gameplay.

Use your keyboard's arrow keys to move and rotate the falling pieces.

Your goal is to clear as many lines as possible before the blocks reach the top of the screen.

Enjoy the classic game of Tetris!