Choose The Test: Secrets of the Soul
Choose The Test: Secrets of the Soul if you want an Adventure, Simulation, and Free To Play experience. On Steam, it's free to play, so the barrier to trying it is zero. 1,409 Steam reviews back the pick.
The Test: Secrets of the Soul vs Who Killed Mr X
The Test: Secrets of the Soul and Who Killed Mr X both land in Indie, RPG 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 Indie, RPG on Steam. The Test: Secrets of the Soul (2023) is 3 years older than Who Killed Mr X (2026). The Test: Secrets of the Soul is free; Who Killed Mr X is paid (Price unknown). 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 Who Killed Mr X
Choose Who Killed Mr X if you want the Custom Volume Controls, Playable without Timed Input, and Keyboard Only Option side of the pairing. On Steam, it's the newer release (2026) and ships with the modern feature baseline. Who Killed Mr X launched in 2026.
Both The Test: Secrets of the Soul and Who Killed Mr X sit in Indie and RPG 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
 The Test: Secrets of the Soul |  Who Killed Mr X | |
|---|---|---|
| Released | 2023 | 2026 |
| Genres | Indie, Adventure, Simulation, RPG, Free To Play, Casual | Indie, RPG |
| Platforms | Windows | Windows |
| Steam Deck | Deck Verified | Unrated |
| Price | Free to play | Price unknown |
| Steam reviews | 98% positive (1,409 reviews) | — |
| Multiplayer | Single-player only | Single-player only |
| Developers | Randumb Studios | ENDAI |
Side by side
- Both share Indie, RPG on Steam.
- The Test: Secrets of the Soul (2023) is 3 years older than Who Killed Mr X (2026).
- The Test: Secrets of the Soul is free; Who Killed Mr X is paid (Price unknown).
- The Test: Secrets of the Soul is Deck Verified on Steam Deck; Who Killed Mr X has no Deck rating yet.
The Test: Secrets of the Soul vs Who Killed Mr X — FAQ
- Should I play The Test: Secrets of the Soul or Who Killed Mr X first?
- If you want chronology, The Test: Secrets of the Soul (2023) came out before Who Killed Mr X (2026). 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 The Test: Secrets of the Soul and Who Killed Mr X similar?
- They overlap on Indie, RPG 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.
- Is The Test: Secrets of the Soul free?
- Yes — The Test: Secrets of the Soul is a free-to-play Steam title. Who Killed Mr X is paid (Price unknown).
- Does The Test: Secrets of the Soul run on Steam Deck?
- Yes — The Test: Secrets of the Soul is rated Deck Verified by Valve. Who Killed Mr X doesn't have a Deck rating yet, so its Deck behaviour is currently unverified.