Content Warning

The gameplay of Content Warning bears similarities to Lethal Company and Phasmophobia, two cooperative survival horror video games played from a first-person perspective. Up to four players can team up to venture into the Old World, complexes of underground ruins with descending entrances to procedurally-generated rooms containing lost items, artifacts, and hostile creatures. The Old World is more than hundreds of millions of meters across. While players are in the Old World, they have oxygen meters that slowly deplete over five hundred seconds unless they are inside the diving bell that takes them to and from the Old World, which pauses the timer.

Players are tasked with recording the monsters they encounter on camera, then escaping to Sky Island to upload the recorded video to Spooktube to gain views and ad revenue. The number of views and the money gained are scaled by how dangerous the captured monsters are, their presence on the screen, and their interaction with players. Some gadgets can boost the views and ad revenue as well. Once uploaded, players can save their videos to their computer in .webm format.

Content Warning received positive reviews on online game platforms like Steam. Within twelve hours of the game's launch, it reached 50 thousand concurrent players on Steam. The game reached an all-time high of over 200 thousand concurrent players in less than 24 hours after launch. During the launch period, it was stated that the game was claimed by around 6.2 million Steam users. By mid-April 2024, Landfall stated the game had sold more than one million copies atop those claimed while it was free.