Choose Portal 2
Choose Portal 2 if you want an Action game with Multi-player, Shared/Split Screen, and Online Co-op. On Steam, it's Steam Deck Verified, so handheld play works out of the box. 169,764 Steam reviews back the pick.
Portal 2 vs Lost/Secret A
Portal 2 and Lost/Secret A both land in 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 are Adventure games on Steam. Portal 2 (2011) is 15 years older than Lost/Secret A (2026). Lost/Secret A is currently ~60% cheaper on Steam than Portal 2 (4.00 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 Lost/Secret A
Choose Lost/Secret A if it's currently about 60% cheaper on the Steam Store. Lost/Secret A launched in 2026.
Both Portal 2 and Lost/Secret A sit in 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
 Portal 2 |  Lost/Secret A | |
|---|---|---|
| Released | 2011 | 2026 |
| Genres | Action, Adventure | Adventure |
| Platforms | Windows, Linux | Windows |
| Steam Deck | Deck Verified | Unrated |
| Price | 9.99 USD | 4.00 USD |
| Steam reviews | 98.9% positive (169,764 reviews) | — |
| Multiplayer | Multi-player, Online Co-op, Shared/Split Screen Co-op | Single-player only |
| Developers | Valve | uehara create |
Side by side
- Both are Adventure games on Steam.
- Portal 2 (2011) is 15 years older than Lost/Secret A (2026).
- Lost/Secret A is currently ~60% cheaper on Steam than Portal 2 (4.00 USD vs. 9.99 USD).
- Portal 2 has co-op; Lost/Secret A does not.
- Portal 2 is Deck Verified on Steam Deck; Lost/Secret A has no Deck rating yet.
Portal 2 vs Lost/Secret A — FAQ
- Should I play Portal 2 or Lost/Secret A first?
- If you want chronology, Portal 2 (2011) came out before Lost/Secret A (2026). 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 Portal 2 and Lost/Secret A similar?
- They overlap on 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 Lost/Secret A have multiplayer like Portal 2?
- No. Portal 2 supports multiplayer on Steam (Multi-player, Online Co-op, Shared/Split Screen Co-op), while Lost/Secret A is listed as single-player only.
- Does Portal 2 run on Steam Deck?
- Yes — Portal 2 is rated Deck Verified by Valve. Lost/Secret A doesn't have a Deck rating yet, so its Deck behaviour is currently unverified.