As of right now, you cannot play Roblox on PS5 or PS4. Roblox is currently not available to purchase or download on Sony's PlayStation consoles. You can technically try to play it via the PS4's web browser, but this is not a good way to play the game.
There has been no official announcement that Roblox will come to PS5 and PS4. However, there are rumours that Roblox is indeed in development for Sony's platforms, coming alongside a big redesign.
Currently, Roblox is available and playable on PC, Mac, iOS, Amazon Fire, Android, and Xbox One. Although you can't play it on PS5 or PS4 right now, the game is accessible from many other devices.
Thankfully, Roblox isn’t limited to a single system, and you can currently play that game on Microsoft Windows, Android, iOS, Xbox One, and macOS.
There’s a slight silver lining for PS4 players though because if you decide to switch to PC you can opt to use your PS4 controller instead of using a mouse and keyboard, and this is very beneficial for a seamless experience.
Currently, you only have access to Phasmophobia on Microsoft Windows PC with no plans to make it available for other systems at the moment.
Sadly Phasmophobia is not on any version of the XBOX currently and there are no signs of this happening any time soon.
It had an early release on Steam and Windows on September 18th of 2020 and then was later released with massive success due to the high influx of popularity from mass streaming online.
The PS4 offers a fantastic catalog of great games, but sometimes you just want to play Roblox instead.
Once you've opened the web browser you'll need to go to https://www.roblox.com/NewLogin. After you log in, you'll be prompted to download the game to play in your web browser.