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TIS-100
TIS-100 is an open-ended programming game by Zachtronics, the creators of SpaceChem and Infinifactory, in which you rewrite corrupted code segments to repair the TIS-100 and unlock its secrets. It’s the assembly language programming game you never asked for!
What players say
Steam review score and the most-helpful voices, which may include critical ones. Data as of 2026-05-20.
“If you like puzzles and low-level assembly programming then you are going to like TIS-100. I was able to finish all the puzzles by myself for the first 100% with the exception of "Sequence Sorter". Anyway best of luck to you, it's rough. Edit: I was finally able to finish…”
— a player, Steam review · 59 hrs played“TIS-100 is an excellent game. It's not for everyone, and while I know some people may think I'm crazy for this statement, but it made me a better programmer, and I think that's one of the best things about it. I enjoyed every minute of, and still occasionally go come back to…”
— a player, Steam review · 68 hrs played“This what they doin on those computers in severance”
— a player, Steam review · 16 hrs playedPlayer activity
Monthly average concurrent players. Live count fetched 2026-07-11 12:22 UTC · history via SteamCharts.
Achievement stats
Global completion rates across all Steam players — a data view of how far people actually get. Source: Steam official stats · as of 2026-07-25.
Price tracking
US-region pricing (USD), sampled twice daily by our own tracker since 2026-07-11. Steam prices vary by region — always confirm your local price on Steam.
Regional prices at last sample, in local currency — Steam sets each region's price independently.
Cheapest → most expensive, converted to USD at ECB reference rates (2026-07-24). Relative comparison only.
Latest official news
Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.
UPDATE: Fixing missing leaderboards
Today's update fixes a bug where some leaderboards would not show up in the bonus campaign. If you see anything weird in the game, whether or not it's related to leaderboards, please send me an email
Last Call BBS - The last game by Zachtronics!
Boot up your Z5 Powerlance and dial into Last Call BBS, the last game from Zachtronics! The Barkeep’s loaded up his retro computer with a full set of puzzle games for you to download and play. No need
UPDATE: Fixing the crash handler and histograms
Today's update fixes the crash handler and histograms. Nothing else should be affected.
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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 2026-05-20.
| Genres | Indie, Simulation |
| Player tags | Programming · Puzzle · Indie · Simulation · Difficult · Hacking · Logic · Singleplayer · Education · Automation · Psychological Horror · Coding (SteamSpy community voting) |
| Features | Single-player · Steam Achievements · Steam Cloud · Steam Leaderboards · Includes level editor · Family Sharing |
| Languages | English |
| Achievements | 10 |
| Estimated owners | 200,000 – 500,000 (SteamSpy) |
| Official site | http://www.zachtronics.com/tis-100 |
Minimum system requirements (PC)
Minimum: OS *: Windows XP / Vista / 7 / 8 / 10 Processor: 2.0 GHz Memory: 2 GB RAM Storage: 100 MB available space