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J.A.C.K.
Brand new level editor for games with a Quake-style BSP architecture; a convenient cross-platform tool capable of incorporating the best features of existing editors, such as Valve Hammer Editor, Q3Radiant, and others. J.A.C.K. does aspire to be the universal level design tool for classic games.
What players say
Steam review score and the most-helpful voices, which may include critical ones. Score via SteamSpy as of 2026-05-14.
“dis gaim maks ME kreit maps! totaali suk.”
— a player, Steam review · 2 hrs played“Been using for GoldSRC games for a while now and it is amazing. Good 10/10”
— a player, Steam review · 505 hrs played“smooth, simple experience. certainly better than hammer editor.”
— a player, Steam review · 24 hrs playedPlayer activity
Monthly average concurrent players. Live count fetched 2026-08-02 22:17 UTC · history via SteamCharts.
Latest official news
Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.
Beta update: 1.2.4520
New feature: ignore fit per-axis in Fit Texture dialog. New feature: command filter for shortcut list in Preferences. Improvement: when a node is selected, its index is displayed in Status Bar (Path t
Beta update: 1.2.4334
New feature: Object Browser (primitives, prefabs). New feature: "dark" color scheme support. New feature: new color scheme "Valve Hammer Editor (Dark)". New feature: configurable keys (shortcuts) in P
Minor update for 1.1.3773
Fixed a couple of minor issues: - Background image preview not working for Y/Z projection unless re-opening the dialog. - Localization problems of toolbar status tips. - Stale web resource links in th
J.A.C.K. Update - 1.1.3773
As you likely know, the most recent J.A.C.K. updates and bug fixes have been kept in beta branch for a while. These updates and fixes are only available to those who opted in the beta program. The hol
J.A.C.K. Update - 1.1.2800
J.A.C.K. editor has been in development for a long time. However, in recent years, all updates and bug fixes were kept in beta status, and were only available to those who opted in the beta program. A
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Screenshots
Official Steam store screenshots — click any shot to enlarge.
Facts & details
From the Steam store record, snapshot 2026-05-14.
| Genres | Animation & Modeling, Design & Illustration, Utilities, Game Development |
| Player tags | Game Development · Utilities · Animation & Modeling · Design & Illustration · Level Editor · Sandbox (SteamSpy community voting) |
| Features | Steam Achievements · Steam Trading Cards · Steam Cloud · Stats · Includes level editor |
| Languages | English, Polish, Russian, Ukrainian, Belarusian |
| Achievements | 18 |
| Estimated owners | 20,000 – 50,000 (SteamSpy) |
| Official site | http://crystice.com/jack/ |
Minimum system requirements (PC)
Minimum: OS *: Windows 7 or newer Processor: CPU 1 GHz Memory: 1 GB RAM Graphics: 256 Mb video card Storage: 50 MB available space