Choose Linelight
Choose Linelight if it's Steam Deck Verified, so handheld play works out of the box. Linelight launched in 2017.
Linelight vs UNDEFINED
Linelight and UNDEFINED both land in Action, 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 Action, Indie, Adventure on Steam. Linelight (2017) is 2 years older than UNDEFINED (2019). UNDEFINED is currently ~90% cheaper on Steam than Linelight (0.99 USD vs. 9.99 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 UNDEFINED
Choose UNDEFINED if it's currently about 90% cheaper on the Steam Store. UNDEFINED launched in 2019.
Both Linelight and UNDEFINED sit in Action, 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
 Linelight |  UNDEFINED | |
|---|---|---|
| Released | 2017 | 2019 |
| Genres | Action, Indie, Adventure, Casual | Action, Indie, Adventure, Casual |
| Platforms | Windows, macOS, Linux | Windows |
| Steam Deck | Deck Verified | Unrated |
| Price | 9.99 USD | 0.99 USD |
| Steam reviews | 96.6% positive (437 reviews) | 1 reviews |
| Multiplayer | Single-player only | Single-player only |
| Developers | My Dog Zorro | Axe Games |
Side by side
- Both share Action, Indie, Adventure on Steam.
- Linelight (2017) is 2 years older than UNDEFINED (2019).
- UNDEFINED is currently ~90% cheaper on Steam than Linelight (0.99 USD vs. 9.99 USD).
- Linelight is Deck Verified on Steam Deck; UNDEFINED has no Deck rating yet.
Linelight vs UNDEFINED — FAQ
- Should I play Linelight or UNDEFINED first?
- If you want chronology, Linelight (2017) came out before UNDEFINED (2019). 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 Linelight and UNDEFINED similar?
- They overlap on Action, 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.
- Does Linelight run on Steam Deck?
- Yes — Linelight is rated Deck Verified by Valve. UNDEFINED doesn't have a Deck rating yet, so its Deck behaviour is currently unverified.