Play Tetris Online: A Step-by-Step Guide

Visit a website that offers online Tetris. Popular options include 'Tetris.com' and 'PlayTetris.org'.

Sign up for a free account if necessary. Some websites require an account in order to save your progress and post high scores.

Select the type of game you want to play. Different websites may offer different variations of the classic game, such as two-player or tournament versions.

Use the arrow keys on your computer keyboard to move the pieces and the spacebar to rotate them.

Clear lines by filling them up with the falling pieces. The more lines you clear, the higher your score will be.