Sig.NULL

Sig.NULL

SaintHeiser · September 27, 2016 · Indie, Casual, Puzzle, Difficult, 2D

Sig.NULL is free to play — no purchase needed. We track it so you know if that ever changes.

PC
Mostly Positive72% · 1371playing now
Best price
Free
Get it free on Steam

Prices last checked

Cheapest Sig.NULL keys — keyshops

Keyshops are third-party marketplaces — keys are resold and can be region-locked or a different edition. Check the listing's region & edition before buying.

Gameseal
Standard Edition · Steam
$0.35
Buy
Eneba
Standard Edition · Steam
$0.61
Buy
CJS CD Keys
CJS CD Keys
Standard Edition · Steam
$1.59
Buy

Screenshots

Sig.NULL price

Sig.NULL is free to play — there is no purchase price, on Steam or anywhere else we track. We keep watching it, so if it ever stops being free the price history on this page will show when that happened and what it changed to.

About Sig.NULL

Your task is to put things at their places inside a complex computer system. It’s a whole world with its own laws and filled by mono-drones, which you will control. Use them to place tetra-blocks at its places.
  • There are up to 8 different types of mono-drones with individual features (explode, swap, infect, time-control and more)
  • Hidden rules of game world, which you have to explore for progression
  • Non-linear. You always have few levels to try. If you can't solve one, then try another!
  • More than 100 levels which were built with care for you to learn all the rules step by step.

Reach System Core and discover how this techno world was born!

Sig.NULL — game info

Platforms
Windows
Player modes
Single-player
Controller
Full controller support
PC Game Pass
Not included

What Steam players say

Recent verbatim reviews from Steam — separate from playze.io community reviews below.

Not recommended Jun 14, 2026
I did not enjoy this puzzle game play but as it is free, it could be worth a try if you like these. FYI This game no longer gives you the black square emoticon for 2 hour game play and it is not on market. The only emoticon available for purchase in the point shop is the penguin. I hope this is glitch. I used different emoji in the meantime, see comments for kitten emoticon art
13 found this helpful
Recommended Jul 12, 2025
⠀
7 found this helpful
Recommended Aug 18, 2026
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 feels like a fairly normal Sokoban style puzzle, but the game slowly starts introducing different drone abilities and hidden rules that completely change how I approach each level. I like that the game does not explain everything immediately because figuring out how the world works is a big part of the experience. The best thing about Sig.NULL for me is the way the puzzles keep adding new ideas. There are more than 100 levels and up to eight different types of drones, with abilities that can involve things like exploding, swapping, infecting blocks and controlling time. Some drones can also affect other objects in ways that I do not initially expect. This means I am not simply pushing one box around a room and looking for an obvious route. I have to understand how several things interact and sometimes completely rethink what I thought a particular object was supposed to do. I also really like the non linear …
Recommended Jan 5, 2026
Sokoban with a twist. It's not easy to start as you have to figure out some things on your own, but the puzzles are nice.
Recommended Oct 27, 2025
Игра Sig.NULL - это мрачное и атмосферное погружение в мир киберпанка, пропитанный безысходностью и моральными дилеммами. Визуальный стиль, выполненный в пиксельной графике, идеально передает ощущение упадка и технологической антиутопии. Сюжет, хотя и не отличается особой оригинальностью, держит в напряжении благодаря хорошо прописанным персонажам и нелинейности повествования. Ты постоянно сталкиваешься с тяжелыми выборами, последствия которых влияют на дальнейшее развитие истории. Геймплейно Sig.NULL - это смесь point-and-click квеста и визуальной новеллы. Исследование локаций, сбор информации и взаимодействие с персонажами составляют основу игрового процесса. Головоломки не отличаются особой сложностью, но логично вплетены в общий сюжет, требуя от игрока внимания к деталям и умения анализировать информацию. Атмосфера игры, созданная за счет саундтрека и детализированного окружения, заслуживает отдельной похвалы. Музыка идеально дополняет мрачный визуальный стиль, а детализированные пиксельные локации создают ощущение настоящего киберпанк-города. В целом, Sig.NULL - это отличная игра для тех, кто ценит атмосферные и сюжетно-ориентированные проекты. Несмотря на свою простоту, он…
Not recommended Oct 13, 2025
I like the description 'repetitive and strange'

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