In order to successfully start Atlantica Online from the website, you’ll need to ensure that NGM (Nexon Game Manager) is installed on your computer. NGM ensures that Atlantica Online runs successfully, regardless of what browser you use to access Atlantica Online.Nexon.net. Follow the instructions below to start Atlantica Online from the website.
Click the button below to start downloading NGMDownload NGM
If you see the following dialog box, click “Run”
...and you’re done. NGM is now installed, and you can start Atlantica Online from the website.
Go back to Atlantica Online.Nexon.net and click "Start Game" button.