Choose Lemma
Choose Lemma if you want an Adventure game with Steam Leaderboards. Lemma launched in 2015.
Lemma vs Celestial Hacker Girl Jessica
Lemma and Celestial Hacker Girl Jessica both land in Action, 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 share Action, Indie on Steam. Lemma (2015) is 3 years older than Celestial Hacker Girl Jessica (2018). Celestial Hacker Girl Jessica scores higher on Steam reviews (97.4% positive) than Lemma (84.4% 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 Celestial Hacker Girl Jessica
Choose Celestial Hacker Girl Jessica if it's currently about 87% cheaper on the Steam Store. Celestial Hacker Girl Jessica launched in 2018.
Both Lemma and Celestial Hacker Girl Jessica sit in Action and Indie 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
 Lemma |  Celestial Hacker Girl Jessica | |
|---|---|---|
| Released | 2015 | 2018 |
| Genres | Action, Indie, Adventure | Action, Indie |
| Platforms | Windows | Windows, macOS |
| Steam Deck | Deck Playable | Unrated |
| Price | 14.99 USD | 1.99 USD |
| Steam reviews | 84.4% positive (96 reviews) | 97.4% positive (39 reviews) |
| Multiplayer | Single-player only | Single-player only |
| Developers | Helvetica Scenario | girl software |
Side by side
- Both share Action, Indie on Steam.
- Lemma (2015) is 3 years older than Celestial Hacker Girl Jessica (2018).
- Celestial Hacker Girl Jessica scores higher on Steam reviews (97.4% positive) than Lemma (84.4% positive).
- Celestial Hacker Girl Jessica is currently ~87% cheaper on Steam than Lemma (1.99 USD vs. 14.99 USD).
- Lemma is Deck Playable on Steam Deck; Celestial Hacker Girl Jessica has no Deck rating yet.
Lemma vs Celestial Hacker Girl Jessica — FAQ
- Should I play Lemma or Celestial Hacker Girl Jessica first?
- If you want chronology, Lemma (2015) came out before Celestial Hacker Girl Jessica (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 Lemma and Celestial Hacker Girl Jessica similar?
- They overlap on Action, 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 Lemma run on Steam Deck?
- Yes — Lemma is rated Deck Playable by Valve. Celestial Hacker Girl Jessica doesn't have a Deck rating yet, so its Deck behaviour is currently unverified.