Choose Black Mesa
Choose Black Mesa if you want an Adventure game with Multi-player, Includes Source SDK, and Online PvP. 69,272 Steam reviews back the pick.
Black Mesa vs Test Subject
Black Mesa and Test Subject both land in Action, Indie on Steam, which is why they keep getting compared. The comparison below is built from each game's Steam metadata — release year, genres, categories, Steam Deck status, price, and review score — refreshed daily by imho.run's scraper. Headline differences: Both share Action, Indie on Steam. Black Mesa (2020) is 4 years older than Test Subject (2024). Test Subject is currently ~95% cheaper on Steam than Black Mesa (0.99 USD vs. 19.99 USD). No login or purchase needed — scroll for the full table, the verdict FAQ, and links to ranked similar games for both titles.
Which should you pick?
Choose Test Subject
Choose Test Subject if it's currently about 95% cheaper on the Steam Store. Test Subject launched in 2024.
Both Black Mesa and Test Subject sit in Action and Indie on Steam, so either pick lands in the same broad neighborhood. Use the side-by-side table for the feature view, or follow the "Games like" links below to see ranked alternatives for either title.
Side-by-side comparison
 Black Mesa |  Test Subject | |
|---|---|---|
| Released | 2020 | 2024 |
| Genres | Action, Indie, Adventure | Action, Indie |
| Platforms | Windows, Linux | Windows |
| Steam Deck | Deck Playable | Unrated |
| Price | 19.99 USD | 0.99 USD |
| Steam reviews | 94.9% positive (69,272 reviews) | 2 reviews |
| Multiplayer | Multi-player, Cross-Platform Multiplayer | Single-player only |
| Developers | Crowbar Collective | Autonomous Tree |
Side by side
- Both share Action, Indie on Steam.
- Black Mesa (2020) is 4 years older than Test Subject (2024).
- Test Subject is currently ~95% cheaper on Steam than Black Mesa (0.99 USD vs. 19.99 USD).
- Black Mesa is Deck Playable on Steam Deck; Test Subject has no Deck rating yet.
Black Mesa vs Test Subject — FAQ
- Should I play Black Mesa or Test Subject first?
- If you want chronology, Black Mesa (2020) came out before Test Subject (2024). If neither is a sequel to the other, order doesn't really matter — start with whichever fits your current mood, since both share enough on Steam to make either a reasonable opener.
- Are Black Mesa and Test Subject similar?
- They overlap on Action, Indie on Steam, so the catalogue groups them together — but "similar" depends on the specific mechanics. Use the genre + category rows above to decide whether the overlap matches what drew you to the one you've already played.
- Does Test Subject have multiplayer like Black Mesa?
- No. Black Mesa supports multiplayer on Steam (Multi-player, Cross-Platform Multiplayer), while Test Subject is listed as single-player only.
- Does Black Mesa run on Steam Deck?
- Yes — Black Mesa is rated Deck Playable by Valve. Test Subject doesn't have a Deck rating yet, so its Deck behaviour is currently unverified.