Play Tetris Online: A Step-by-Step Guide

Go to a website that hosts online Tetris games, such as TetrisFriends.com, Tetris99.com, or TetrisGame.org.

Create an account if necessary.

Once you are logged in, you can choose to play a single player game or a multi-player game.

For single player games, you can choose the difficulty level and the type of game (e.g. Marathon, Ultra, or Sprint).

For multi-player games, you can choose the type of game (e.g. Versus or Battle Royale) and the number of players.

Once you have chosen a game type, click the 'Play Now' button and the game will begin.

Use your keyboard or mouse to control the falling blocks and try to complete lines.

When you complete lines, points will be awarded and the game will end when there are no more lines to complete.