Choose Biotoxin: The Dark Days
Choose Biotoxin: The Dark Days if it's currently about 80% cheaper on the Steam Store. Biotoxin: The Dark Days launched in 2017.
Biotoxin: The Dark Days vs Diary of Defender
Biotoxin: The Dark Days and Diary of Defender both land in Action, Indie, Adventure 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, Adventure on Steam. Biotoxin: The Dark Days (2017) is 1 year older than Diary of Defender (2018). Biotoxin: The Dark Days is currently ~80% cheaper on Steam than Diary of Defender (2.99 USD vs. 14.99 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 Diary of Defender
Choose Diary of Defender if you want a Simulation and Early Access game with Tracked Controller Support and VR Only. Diary of Defender launched in 2018.
Both Biotoxin: The Dark Days and Diary of Defender sit in Action, Indie, and Adventure 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
 Biotoxin: The Dark Days |  Diary of Defender | |
|---|---|---|
| Released | 2017 | 2018 |
| Genres | Action, Indie, Adventure, Violent, Gore | Action, Indie, Adventure, Simulation, Early Access, Violent, Gore |
| Platforms | Windows | Windows |
| Steam Deck | Unrated | Unrated |
| Price | 2.99 USD | 14.99 USD |
| Steam reviews | 70% positive (10 reviews) | — |
| Multiplayer | Single-player only | Single-player only |
| Developers | Fivesyounger Development | 5th VR |
Side by side
- Both share Action, Indie, Adventure on Steam.
- Biotoxin: The Dark Days (2017) is 1 year older than Diary of Defender (2018).
- Biotoxin: The Dark Days is currently ~80% cheaper on Steam than Diary of Defender (2.99 USD vs. 14.99 USD).
Biotoxin: The Dark Days vs Diary of Defender — FAQ
- Should I play Biotoxin: The Dark Days or Diary of Defender first?
- If you want chronology, Biotoxin: The Dark Days (2017) came out before Diary of Defender (2018). 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 Biotoxin: The Dark Days and Diary of Defender similar?
- They overlap on Action, Indie, Adventure 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.