What it likely sold — estimate, stated as a range on purpose
Lifetime units: ~21k
(P10–P90: 8.4k – 46.2k)
Gross revenue: ~$206k
(P10–P90: $82.5k – $454k)
Estimate, method v1.0 — before Steam's ~30% share, refunds and VAT. The band approximates where about 8 in 10 comparable games land in published studies; some sit outside it. Our own hit rate goes on the accuracy ledger once measured. How we estimate
Estimates are statistical inferences from public data. They are not sourced from Valve or the developer and may deviate materially from actual results. Do not rely on them for investment or contractual decisions. As of Oct 1, 2026.
Player voice — measured shares of Steam thumbs, never a model
Story & writing84% positive · 116 mentions
“Right, so here's the thing about ZERO PROTOCOL: it's a tiny indie horror game that's nicked the soul of System Shock, stuffed it into a 283 MB file held together with spit and Russian error messages, and somehow - somehow - it works. I'm…”
Recommended · Steam review · Jun 2026 · 11 h played · Report / request removalGameplay & mechanics75% positive · 106 mentions
“Right, so here's the thing about ZERO PROTOCOL: it's a tiny indie horror game that's nicked the soul of System Shock, stuffed it into a 283 MB file held together with spit and Russian error messages, and somehow - somehow - it works. I'm…”
Recommended · Steam review · Jun 2026 · 11 h played · Report / request removalVisuals & audio75% positive · 100 mentions
“Right, so here's the thing about ZERO PROTOCOL: it's a tiny indie horror game that's nicked the soul of System Shock, stuffed it into a 283 MB file held together with spit and Russian error messages, and somehow - somehow - it works. I'm…”
Recommended · Steam review · Jun 2026 · 11 h played · Report / request removalContent & longevity83% positive · 46 mentions
“Right, so here's the thing about ZERO PROTOCOL: it's a tiny indie horror game that's nicked the soul of System Shock, stuffed it into a 283 MB file held together with spit and Russian error messages, and somehow - somehow - it works. I'm…”
Recommended · Steam review · Jun 2026 · 11 h played · Report / request removalPrice & value83% positive · 46 mentions
“Right, so here's the thing about ZERO PROTOCOL: it's a tiny indie horror game that's nicked the soul of System Shock, stuffed it into a 283 MB file held together with spit and Russian error messages, and somehow - somehow - it works. I'm…”
Recommended · Steam review · Jun 2026 · 11 h played · Report / request removalPerformance & stability68% positive · 41 mentions
“Right, so here's the thing about ZERO PROTOCOL: it's a tiny indie horror game that's nicked the soul of System Shock, stuffed it into a 283 MB file held together with spit and Russian error messages, and somehow - somehow - it works. I'm…”
Recommended · Steam review · Jun 2026 · 11 h played · Report / request removalDifficulty & balance70% positive · 23 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 · Report / request removalControls & UI67% positive · 18 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 · Report / request removal301 recent English reviews stored · topics keyword-matched · topics under 12 mentions stay hidden · methodology
Reviews are shown as published on Steam, including reviews from key activations and free copies — so percentages here can differ from the score on the Steam store page. GameTrend does not check whether reviewers bought or played the game.