Mouthwashing found the right director in Karyn Kusama

Sony Pictures has picked up the feature film rights to Mouthwashing, the 2024 psychological horror game from Stockholm developer Wrong Organ and publisher Critical Reflex. Deadline reports that Karyn Kusama is attached to direct, with Matt Manfredi and Phil Hay writing, and Scott Derrickson, C. Robert Cargill and Vince Cheng producing under their Crooked Highway banner, which has a deal with Sony's Screen Gems.

Of all the game deals Hollywood has made this year, this is the one that made me sit up. Not because Mouthwashing is big. Because it is small, mean, and very hard to adapt badly if you hire the right people, and on paper Sony has.

What the game is, without the spoilers

Premise only, because this is a game you should go into cold. Five crew members are stranded aboard the space freighter Tulpar after it crash lands on an asteroid, and as The Hollywood Reporter puts it, dwindling supplies, isolation and mounting paranoia expose the fractures between them. It is first person, it plays with time, and it is much more interested in guilt than in monsters.

The numbers the trades cite are why a studio noticed. Per THR, it scored 88 on Metacritic, has "overwhelmingly positive" user reviews on Steam, and has sold nearly one million units on PC. It won best narrative and players' choice at the Horror Game Awards and best hidden gem at the New York Game Awards. Wrong Organ says content about the game has drawn 63 million YouTube views and close to a billion on TikTok. The Steam listing dates the original PC release to September 26, 2024.

The timing is not subtle either. The game launched on PlayStation 5, PlayStation 4, Nintendo Switch, Xbox Series X and S, Xbox One and Xbox on PC on the same day as the film news, and it landed on Game Pass day one.

The team, side by side

The reason I like this deal is the crew. Here is who is on it and the credits the trades list for each, so you can judge the fit yourself.

Look at the middle row. Kusama, Manfredi and Hay made The Invitation together. That film is a dinner party where you spend most of the runtime waiting for something to go wrong, and the dread comes from grief that nobody at the table will say out loud. If you have played Mouthwashing, you know why that is almost a perfect pitch.

The Invitation is a dinner party built on grief nobody will name. That is already the Mouthwashing pitch.

The hard part is the structure

Here is my worry, and it is a specific one. Mouthwashing works because it is nonlinear. It cuts between before and after, and your understanding of the crew changes as the pieces come together. THR describes it as a "nonlinear narrative that explores responsibility, denial and the consequences of unchecked power." Films can do nonlinear, obviously. But a game can make you complicit by putting the controls in your hands, and a movie can only make you watch.

That is where the Kusama hire matters most. Destroyer was also built on jumping between a past and a present that do not match, and it worked because the performance in the middle carried both timelines. A Mouthwashing film needs exactly that: one actor who can play the same man before and after without telegraphing what changed. Casting that lead will tell us more about this movie than any trailer.

The other risk is length. The game is short and claustrophobic. If the film stretches it with new action set pieces on the asteroid, it will lose the thing that made people make all those TikToks. Deadline says the storyline is under wraps, so we do not know yet how faithful the script is.

Play it first, and here is how

• You have Game Pass: it joined Game Pass on console and PC on October 29, per Xbox Wire. That is the cheapest way in.
• You want the original version: PC on Steam, where it has been since 2024.
• You play on a handheld: the Switch version is out now, per Engadget.
• You scare easily: Engadget notes it is not chock full of jump scares. The horror is in the themes. Check the content warnings on the store page before you start; the subject matter is heavy.
• You only want the premise: stop reading forums now. Plot discussion online spoils the thing the whole game is built around.

Where this sits in the game movie wave

Game adaptations have been all over the place this month. The Street Fighter reviews were most united on the 2D animated flashbacks, the part closest to the games, and I argued the Samurai Shodown film was the smart first pick from the SNK slate. Mouthwashing is a different animal: no fighting game roster, no legacy brand, just a small team's story that went viral. If Sony protects that, it could be the most interesting adaptation of the bunch.

My read

No cast, no date, no release window. Just a director, two writers who have done this exact tone with her before, and a producer who knows how to make a modest horror film profitable. That is the right order to build it in. I would rather see this one take its time than hit a date. If Kusama gets to make The Invitation in space, I am buying a ticket.

How we made this: researched and drafted with AI assistance. Sources are linked in the piece.