Full game metadata
| Field | Value |
|---|---|
| Steam app type | game |
| Steam App ID | 4436880 |
| Live current players | 0 |
| SteamPulse tracked peak | 3 |
| Live count (today's peak floor) | 0 |
| Price | $4.99 |
| Free to play | No |
| Discount | 0% |
| Original price USD | $4.99 |
| Current price USD | $4.99 |
| Release date | Mar 18, 2026 |
| Developer | Psycho Dream Studio |
| Publisher | Psycho Dream Studio |
| Owners estimated | Not available |
| SteamSpy owner estimate minimum | Not available |
| SteamSpy owner estimate maximum | Not available |
| Review type | 4 user reviews |
| Positive review percent | 100% |
| Positive reviews | 4 |
| Negative reviews | 0 |
| Total reviews | 4 |
| Steam recommendations | Not available |
| Achievements | Not available |
| Average playtime forever | 197 minutes |
| Windows support | Yes |
| macOS support | No |
| Linux support | No |
| Parent game | Not available |
| Store URL | https://store.steampowered.com/app/4436880/ |
Short description
Co-op first-person horror for 1–4 players. You and your friends are trapped in endless liminal backrooms where nothing makes sense. Explore, find keys and almond water, and work together to evade unstoppable monsters and escape.
About this game
The Silent Expedition Echo Protocol is a co-op first-person horror game for 1–4 players, set in endless liminal “backrooms” where nothing makes sense and reality feels wrong. You are not a soldier or a hero. You are just… stuck. Your only real weapons are your flashlight, almond water – and your friends. You wake up in a cold, humming corridor with no idea how you got there. The rooms repeat, the lights flicker, and every sound echoes forever. - You cannot hurt the monsters. There are no guns, no melee weapons, no way to fight back. - You survive by listening carefully, moving slowly, closing doors and breaking line of sight. - Almond water works as both healing and sanity. Run out, and the backrooms slowly drive you insane. - Proximity voice chat–friendly gameplay: whisper, warn and coordinate with your team… or panic together when you hear something in the dark. You are not alone down here. Several different entities roam the halls, each with their own behaviour and sound design. - Some hunt by sound and will react to your footsteps, doors and voice chat. - Some prefer to stalk from a distance, slowly wearing down your sanity. - Others simply appear where you don’t expect them, turning safe spaces into death traps. None of them can be killed. Your only options are to hide, outsmart them and hope they choose someone else. The backrooms are made up of interconnected levels: offices, storage areas, maintenance tunnels and completely abstract spaces that shouldn’t exist. - Each level has its own layout style, lighting and soundscape. - Important items (keys, codes, mechanical parts, almond water) can spawn in different preset locations each run. - Small puzzles and environmental clues help you unlock new areas and shortcuts. - Dead ends, fake exits and looping corridors play with your sense of direction and reality. The game is designed primarily for co-op, but can be played solo if you want a harder, lonelier experience. - 1–4 player online co-op (PvE only). - Share information: read notes aloud, call out codes, mark doors and warn others when you see movement. - Split up to search faster – or stay together and accept that progress will be s…
Supported languages
English