Choose SpaceChem
Choose SpaceChem if you want a Simulation experience. 1,904 Steam reviews back the pick.
SpaceChem vs Castle
SpaceChem and Castle both land in Indie 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 are Indie games on Steam. SpaceChem (2011) is 4 years older than Castle (2015). SpaceChem scores higher on Steam reviews (95.6% positive) than Castle (52.2% positive). 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 Castle
Choose Castle if you want an Action and Casual experience. On Steam, it's currently about 60% cheaper on the Steam Store. Castle launched in 2015.
Both SpaceChem and Castle sit in Indie on Steam and both list Steam Leaderboards, 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
 SpaceChem |  Castle | |
|---|---|---|
| Released | 2011 | 2015 |
| Genres | Indie, Simulation | Action, Indie, Casual |
| Platforms | Windows, macOS, Linux | Windows |
| Steam Deck | Deck Playable | Unrated |
| Price | 9.99 USD | 3.99 USD |
| Steam reviews | 95.6% positive (1,904 reviews) | 52.2% positive (23 reviews) |
| Multiplayer | Single-player only | Single-player only |
| Developers | Zachtronics | Snails Arcade |
Side by side
- Both are Indie games on Steam.
- SpaceChem (2011) is 4 years older than Castle (2015).
- SpaceChem scores higher on Steam reviews (95.6% positive) than Castle (52.2% positive).
- Castle is currently ~60% cheaper on Steam than SpaceChem (3.99 USD vs. 9.99 USD).
- SpaceChem is Deck Playable on Steam Deck; Castle has no Deck rating yet.
SpaceChem vs Castle — FAQ
- Should I play SpaceChem or Castle first?
- If you want chronology, SpaceChem (2011) came out before Castle (2015). 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 SpaceChem and Castle similar?
- They overlap on Indie 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 SpaceChem run on Steam Deck?
- Yes — SpaceChem is rated Deck Playable by Valve. Castle doesn't have a Deck rating yet, so its Deck behaviour is currently unverified.