Choose Book of Demons
Choose Book of Demons if you want a Casual game with Steam Leaderboards. 3,873 Steam reviews back the pick.
Book of Demons vs Mortal Darkness
Book of Demons and Mortal Darkness 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. Book of Demons (2018) is 7 years older than Mortal Darkness (2025). Mortal Darkness is currently ~60% cheaper on Steam than Book of Demons (9.99 USD vs. 24.99 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 Mortal Darkness
Choose Mortal Darkness if it's currently about 60% cheaper on the Steam Store. Mortal Darkness launched in 2025.
Both Book of Demons and Mortal Darkness 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
 Book of Demons |  Mortal Darkness | |
|---|---|---|
| Released | 2018 | 2025 |
| Genres | Action, Indie, Adventure, RPG, Casual | Action, Indie, Adventure, RPG |
| Platforms | Windows, macOS | Windows |
| Steam Deck | Deck Playable | Unrated |
| Price | 24.99 USD | 9.99 USD |
| Steam reviews | 90.3% positive (3,873 reviews) | 1 reviews |
| Multiplayer | Single-player only | Single-player only |
| Developers | Thing Trunk | Dark Faction Games |
Side by side
- Both share Action, Indie, Adventure on Steam.
- Book of Demons (2018) is 7 years older than Mortal Darkness (2025).
- Mortal Darkness is currently ~60% cheaper on Steam than Book of Demons (9.99 USD vs. 24.99 USD).
- Book of Demons is Deck Playable on Steam Deck; Mortal Darkness has no Deck rating yet.
Book of Demons vs Mortal Darkness — FAQ
- Should I play Book of Demons or Mortal Darkness first?
- If you want chronology, Book of Demons (2018) came out before Mortal Darkness (2025). 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 Book of Demons and Mortal Darkness 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.
- Does Book of Demons run on Steam Deck?
- Yes — Book of Demons is rated Deck Playable by Valve. Mortal Darkness doesn't have a Deck rating yet, so its Deck behaviour is currently unverified.