Choose The Book of Regrets
Choose The Book of Regrets if it's currently about 63% cheaper on the Steam Store. The Book of Regrets launched in 2018.
The Book of Regrets vs Sister Other Paranoia
The Book of Regrets and Sister Other Paranoia both land in 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 Indie, Adventure on Steam. The Book of Regrets (2018) is 8 years older than Sister Other Paranoia (2026). The Book of Regrets is currently ~63% cheaper on Steam than Sister Other Paranoia (2.99 USD vs. 7.99 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 Sister Other Paranoia
Choose Sister Other Paranoia if it's the newer release (2026) and ships with the modern feature baseline. Sister Other Paranoia launched in 2026.
Both The Book of Regrets and Sister Other Paranoia sit in 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
 The Book of Regrets |  Sister Other Paranoia | |
|---|---|---|
| Released | 2018 | 2026 |
| Genres | Indie, Adventure | Indie, Adventure |
| Platforms | Windows, macOS | Windows |
| Steam Deck | Unrated | Deck Playable |
| Price | 2.99 USD | 7.99 USD |
| Steam reviews | 2 reviews | — |
| Multiplayer | Single-player only | Single-player only |
| Developers | Synodic Arc | HazeDenki |
Side by side
- Both share Indie, Adventure on Steam.
- The Book of Regrets (2018) is 8 years older than Sister Other Paranoia (2026).
- The Book of Regrets is currently ~63% cheaper on Steam than Sister Other Paranoia (2.99 USD vs. 7.99 USD).
- Sister Other Paranoia is Deck Playable on Steam Deck; The Book of Regrets has no Deck rating yet.
The Book of Regrets vs Sister Other Paranoia — FAQ
- Should I play The Book of Regrets or Sister Other Paranoia first?
- If you want chronology, The Book of Regrets (2018) came out before Sister Other Paranoia (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 Book of Regrets and Sister Other Paranoia similar?
- They overlap on 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.