Choose Understand
Choose Understand if it's Steam Deck Verified, so handheld play works out of the box. Understand launched in 2020.
Understand vs One Line: Letters and Codes
Understand and One Line: Letters and Codes both land in 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 Indie, Casual on Steam. Understand (2020) is 2 years older than One Line: Letters and Codes (2022). One Line: Letters and Codes scores higher on Steam reviews (92.9% positive) than Understand (91.3% 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 One Line: Letters and Codes
Choose One Line: Letters and Codes if you want the Custom Volume Controls, Playable without Timed Input, and Mouse Only Option side of the pairing. On Steam, it's currently about 80% cheaper on the Steam Store. One Line: Letters and Codes launched in 2022.
Both Understand and One Line: Letters and Codes sit in Indie and Casual on Steam, so either pick lands in the same broad neighborhood. Steam reviews are nearly tied (91.3% vs 92.9% positive), so genre fit is the cleanest tiebreaker — scroll the table for the feature-by-feature view.
Side-by-side comparison
 Understand |  One Line: Letters and Codes | |
|---|---|---|
| Released | 2020 | 2022 |
| Genres | Indie, Casual | Indie, Casual |
| Platforms | Windows, macOS | Windows |
| Steam Deck | Deck Verified | Unrated |
| Price | 3.99 USD | 0.79 USD |
| Steam reviews | 91.3% positive (333 reviews) | 92.9% positive (28 reviews) |
| Multiplayer | Single-player only | Single-player only |
| Developers | Artless Games | Climbing Goat Games |
Side by side
- Both share Indie, Casual on Steam.
- Understand (2020) is 2 years older than One Line: Letters and Codes (2022).
- One Line: Letters and Codes scores higher on Steam reviews (92.9% positive) than Understand (91.3% positive).
- One Line: Letters and Codes is currently ~80% cheaper on Steam than Understand (0.79 USD vs. 3.99 USD).
- Understand is Deck Verified on Steam Deck; One Line: Letters and Codes has no Deck rating yet.
Understand vs One Line: Letters and Codes — FAQ
- Should I play Understand or One Line: Letters and Codes first?
- If you want chronology, Understand (2020) came out before One Line: Letters and Codes (2022). 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 Understand and One Line: Letters and Codes similar?
- They overlap on 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.
- Does Understand run on Steam Deck?
- Yes — Understand is rated Deck Verified by Valve. One Line: Letters and Codes doesn't have a Deck rating yet, so its Deck behaviour is currently unverified.