You can download the free demo directly from the Steam Store page .

The Lite/Demo version is designed to showcase the game's unique cross-platform co-op system.

Playing the free version will not spoil the puzzles or story of the full release. 💸 Full Version Details

For Android users who cannot access the Play Store, trusted mirrors like Uptodown offer the Lite APK for free. 🧩 What is Included in the Free Version?

If you enjoy the demo, the full version typically costs around on platforms like Steam, GOG , and mobile stores.

The developers have released a specific free version called (formerly the Demo) to allow players to test the co-op mechanics without purchasing the full game.

offering the "Full Version" for free. These are often unauthorized and may contain malware or outdated files. The only legitimate ways to play for free are through the official Lite or Demo versions listed above. The Past Within Demo is now available! - Rusty Lake

It offers a condensed experience with different puzzle solutions than the final release.