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Sig.NULL

Sig.NULL

Push and rotate blocks, placing them at their places. Discover mono-drones abilities, step by step learn rules of that somber techno world. Solve more than 100 amazing puzzles!

Released Sep 27, 2016 Developer SaintHeiser Publisher Half-Face Games Platforms Windows IndieCasualPuzzleDifficult2D
View on Steam ↗ Free (US · as of 2026-05-13)

What players say

Steam review score and the most-helpful voices, which may include critical ones. Score via Steam as of 2026-09-28.

71.5%positive137 reviews
Recommended · 0 found this helpful

“Sig.NULL is a puzzle game that looks simple at first but gets much more complicated once I start understanding how everything works. I am controlling small mono drones inside a strange computer system and my main job is to move blocks into their correct positions. At first it…”

— a player, Steam review · 1 hrs played
Read more reviews ↗

Achievement stats

Global completion rates across all Steam players — a data view of how far people actually get. Source: Steam official stats · as of 2026-09-28.

15achievements
7.3%median completion
7.3%rarest: #504 (Gateway Timeout)
7.6% of players 7.4% of players 7.3% of players 7.3% of players 7.3% of players 7.3% of players 7.3% of players 7.3% of players 7.3% of players 7.3% of players 7.3% of players 7.3% of players 7.3% of players 7.3% of players 7.3% of players 7.6% 0% most earned rarest
Almost everyone has
7.6%#418 (I'm a teapot) — Complete <> location.
7.4%#407 (Proxy Authentication Required) — Complete <> location.
7.3%#100 (Continue) — Complete menu tutorial task
Rarest badges of honor
7.3%#504 (Gateway Timeout) — Complete <> location.
7.3%#503 (Service Unavailable) — Complete <> location.
7.3%#501 (Not Implemented) — Complete <> location.

Latest official news

Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.

Sep 04, 2024
Sig.NULL receives FREEdom

Hello, dear players! This game is pretty old. First released at 2014 as free game. Then with small update at 2016 here at Steam. HD version was released at 2020 on XBOX and at 2023 at Steam. This year

Oct 30, 2023
Updated to HD

This is a HD version of game, which was released 3 years ago at XBOX. This version has many improvements, mostly with visuals and usability. But also I had forced to remove some features. The full cha

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From our knowledge graph — ranked by shared traits, not a black box. Each card says why it's here.

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Screenshots

Official Steam store screenshots — click any shot to enlarge.

Facts & details

From the Steam store record, snapshot 2026-09-28.

GenresCasual, Indie, Free To Play
Player tagsIndie · Casual · Puzzle · Difficult · 2D · Exploration · Sokoban · Futuristic · Hacking · Management · Robots · Controller (SteamSpy community voting)
FeaturesSingle-player · Steam Achievements · Full controller support · Steam Trading Cards · Steam Cloud · Family Sharing
LanguagesEnglish, Russian
ControllerFull support
Achievements15
Official sitehttps://half-face.games/games/signull
Minimum system requirements (PC)

Minimum: OS *: Microsoft® Windows® XP / Vista Storage: 25 MB available space