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Steam News11 November 20257mo ago

Side Effects gets multiplayer, launching 21st November!

Hello, treasured test subjects! We've got big news today: Side Effects has a release date and it’s super soon! We’ll be launching on the 21st of November!

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Full SIDE EFFECTS update

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Hello, treasured test subjects!

We've got big news today: Side Effects has a release date and it’s super soon! We’ll be launching on the 21st of November!

On top of that, we can also finally reveal that the game will not only have a solo player mode but support online multiplayer for up to for 4 test subjects. Bluff, betray, deceive, and remember only one of you can survive.

We are having so much fun testing and making multiplayer, can’t wait for you to try it!

Huge thanks for all the support so far, please wishlist if you have not already and see you soon at launch!!

Sincerely,

Your faithful researchers at the Side Effects Team

Source

Steam News / 11 November 2025

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