Choose Half-Life
Choose Half-Life if you want the Multi-player, Online PvP, and PvP side of the pairing. On Steam, it's Steam Deck Verified, so handheld play works out of the box. 57,390 Steam reviews back the pick.
Half-Life vs Test Subject
Half-Life and Test Subject both land in Action 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 are Action games on Steam. Half-Life (1998) is 26 years older than Test Subject (2024). Test Subject is currently ~90% cheaper on Steam than Half-Life (0.99 USD vs. 9.99 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 you want an Indie experience. On Steam, it's currently about 90% cheaper on the Steam Store. Test Subject launched in 2024.
Both Half-Life and Test Subject sit in Action 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
 Half-Life |  Test Subject | |
|---|---|---|
| Released | 1998 | 2024 |
| Genres | Action | Action, Indie |
| Platforms | Windows, macOS, Linux | Windows |
| Steam Deck | Deck Verified | Unrated |
| Price | 9.99 USD | 0.99 USD |
| Steam reviews | 96.5% positive (57,390 reviews) | 2 reviews |
| Multiplayer | Multi-player | Single-player only |
| Developers | Valve | Autonomous Tree |
Side by side
- Both are Action games on Steam.
- Half-Life (1998) is 26 years older than Test Subject (2024).
- Test Subject is currently ~90% cheaper on Steam than Half-Life (0.99 USD vs. 9.99 USD).
- Half-Life is Deck Verified on Steam Deck; Test Subject has no Deck rating yet.
Half-Life vs Test Subject — FAQ
- Should I play Half-Life or Test Subject first?
- If you want chronology, Half-Life (1998) 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 Half-Life and Test Subject similar?
- They overlap on Action 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 Half-Life?
- No. Half-Life supports multiplayer on Steam (Multi-player), while Test Subject is listed as single-player only.
- Does Half-Life run on Steam Deck?
- Yes — Half-Life is rated Deck Verified by Valve. Test Subject doesn't have a Deck rating yet, so its Deck behaviour is currently unverified.