At the top, use the search function to search for Roblox. When you’re taken to the page, select the ‘Play in Browser’ button. Sign in with your Roblox account.

While the traditional way to play Roblox is through the dedicated desktop application, players now have the option to enjoy Roblox games directly in their web browsers using a service called Now.gg.

Fix #5: Use another browser. If the HTTP 503 error service unavailable remains, you can also try to see if you can access your Roblox game using a different browser.

Playing Roblox on Steam Deck via Internet Browser If you want to play Roblox on your Steam Deck via an internet browser, here is what you need to do: Switch on your Steam Deck. Switch to Desktop mode.