Choose SOMOS
Choose SOMOS if you want the Steam Leaderboards side of the pairing. SOMOS launched in 2018.
SOMOS vs Project Rhombus
SOMOS and Project Rhombus both land in Action, Indie, Casual 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, Casual on Steam. Project Rhombus (2017) is 1 year older than SOMOS (2018). Project Rhombus is free; SOMOS is paid (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 Project Rhombus
Choose Project Rhombus if you want a Free To Play game with Custom Volume Controls. On Steam, it's free to play, so the barrier to trying it is zero. Project Rhombus launched in 2017.
Both SOMOS and Project Rhombus sit in Action, Indie, and Casual 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
 SOMOS |  Project Rhombus | |
|---|---|---|
| Released | 2018 | 2017 |
| Genres | Action, Indie, Casual | Action, Indie, Free To Play, Casual |
| Platforms | Windows, macOS, Linux | Windows |
| Steam Deck | Unrated | Deck Verified |
| Price | 7.99 USD | Free to play |
| Steam reviews | 8 reviews | 90.6% positive (688 reviews) |
| Multiplayer | Single-player only | Single-player only |
| Developers | Sideline | SEROSOO |
Side by side
- Both share Action, Indie, Casual on Steam.
- Project Rhombus (2017) is 1 year older than SOMOS (2018).
- Project Rhombus is free; SOMOS is paid (7.99 USD).
- Project Rhombus is Deck Verified on Steam Deck; SOMOS has no Deck rating yet.
SOMOS vs Project Rhombus — FAQ
- Should I play SOMOS or Project Rhombus first?
- If you want chronology, Project Rhombus (2017) came out before SOMOS (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 SOMOS and Project Rhombus similar?
- They overlap on Action, Indie, Casual 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 Project Rhombus free?
- Yes — Project Rhombus is a free-to-play Steam title. SOMOS is paid (7.99 USD).