Press kit

What Was Lost.

A two-player online co-op puzzle game by solo developer Stan Hung. Early Access opens November 30, 2026 on Steam, and the free demo is out now.

Download all media zip, 3.1 MB whatwaslost@staim.ai

Creators and press: email whatwaslost@staim.ai with your channel link for keys.

Keys come in pairs, one for you and one for your co-op partner.

Description

What Was Lost is a first-person puzzle game for two players, online through Steam. One of you plays Ben, in the family house as it was. The other plays Lily, in the same house years later.

You can't see each other's rooms. A clock that still has its hands on Ben's side is bare on Lily's. A drawer that's locked for one of you is open for the other. Most puzzles come down to one person describing something and the other finding it, so you'll talk a lot.

Features

Chapters 1 to 4 in Early Access: the front hall, the kitchen and garden, the library, and the bedroom and garden. A pair usually takes about 2.5 hours.
Chapters 5 to 7 are coming in free updates.
Online co-op for two with push-to-talk voice chat built in. There is no split-screen and no matchmaking, so bring a friend.
There is no combat and no timer, and you can't fail a puzzle.
Subtitles and adjustable text size, a colorblind palette, and reduced motion for camera effects, screen shake and head bob.
Partial controller support, and autosave at the start of each chapter.

From the developer

I've always wanted to make games, even when I was younger. The problem was, it always seemed too expensive or like it would take way too much time.

Eventually, I decided to just go for it and make one myself. I wanted to make something fun for friends or couples to play together, inspired by the kind of co-op games I've always enjoyed.

It's just me making this game, so if you give it a try, I'd love to hear what you think. What worked, what didn't, and what could be better.

Trailer

The trailer plays at the top of the Steam page.

Watch it on Steam ▸

Notes for coverage

Content note. Chapter 4 includes a depiction of suicide.

AI use. Generative AI was used during development for the music (ACE-Step), the voice lines and a few sound effects (ElevenLabs), the framed photographs and some paintings in the house (Qwen-Image), some 3D models (Hyper3D Rodin and Hunyuan3D, then re-meshed and textured in-house) and the key art; no AI model ships with or runs in the game.