What it likely sold — estimate, stated as a range on purpose
Lifetime units: ~20,526
(P10–P90: 8,210 – 45,157)
Gross revenue: ~$201,808
($80,719 – $443,975)
Estimate, method v1.0 — before Steam's ~30% share, refunds and VAT. The band means: we'd be surprised if the truth sat outside it. How we estimate
Player voice — measured shares of Steam thumbs, never a model
Story & writing85% positive · 112 mentions
“Zero Protocol has the ambiance of System Shock, and it plays like a first person early Resident Evil. Though quite short, it does have a good story to tell, and it does it with expert pacing. However, manage your expectations, since this a…”Recommended · Steam review · Apr 2025 · 8 h played
Gameplay & mechanics75% positive · 104 mentions
“6/10; above average unpolished jank on genuine appreciation of the genre. ~5 hours for 1 playthrough (3 endings) I truly enjoyed Zero Protocols aesthetics and gameplay for what they are; it's not trying to oversell you on what it is. It's…”Recommended · Steam review · Feb 2025 · 5 h played
Visuals & audio75% positive · 95 mentions
“6/10; above average unpolished jank on genuine appreciation of the genre. ~5 hours for 1 playthrough (3 endings) I truly enjoyed Zero Protocols aesthetics and gameplay for what they are; it's not trying to oversell you on what it is. It's…”Recommended · Steam review · Feb 2025 · 5 h played
Price & value82% positive · 44 mentions
“It's a short, creepy, slow, cool little horror FPS that reminded me a lot of System Shock 2...without all the great RPG mechanics and extensive story development and everything that makes that game so amazing. I enjoyed this a lot, but it…”Recommended · Steam review · Oct 2025 · 4 h played
Content & longevity81% positive · 43 mentions
“Overall, this game is something I would recommend but with keeping it in mind that it's a very fast game. You can probably beat the game in about 1-2 hours once you know what to do. I got about almost 3 hours out of it. I will replay to…”Recommended · Steam review · Feb 2026 · 3 h played
Performance & stability69% positive · 39 mentions
“Maybe it would be unfair to describe Zero Protocol as "System Shock Lite" but that would be the most economical description. Focusing less on economy: Zero Protocol is a fairly basic horror/FPS/puzzle game that doesn't outstay its welcome…”Recommended · Steam review · Sep 2025 · 7 h played
Difficulty & balance68% positive · 22 mentions
“Maybe it would be unfair to describe Zero Protocol as "System Shock Lite" but that would be the most economical description. Focusing less on economy: Zero Protocol is a fairly basic horror/FPS/puzzle game that doesn't outstay its welcome…”Recommended · Steam review · Sep 2025 · 7 h played
Controls & UI71% positive · 17 mentions
“Hidden gem of a game! Great atmosphere and story. And this is one of those rare games where the story is explained perfectly not just through cryptic metaphores and ♥♥♥♥. Those are good as well, but somethimes I just need a little…”Recommended · Steam review · May 2026 · 9 h played
292 recent English reviews stored · topics keyword-matched · topics under 12 mentions stay hidden · methodology