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 Size story
Portal 2 and Size story 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 12 years older than Size story (2023). Size story is currently ~80% cheaper on Steam than Portal 2 (1.99 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 Size story
Choose Size story if it's currently about 80% cheaper on the Steam Store. Size story launched in 2023.
Both Portal 2 and Size story 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 |  Size story | |
|---|---|---|
| Released | 2011 | 2023 |
| Genres | Action, Adventure | Adventure |
| Platforms | Windows, Linux | Windows |
| Steam Deck | Deck Verified | Unrated |
| Price | 9.99 USD | 1.99 USD |
| Steam reviews | 98.9% positive (169,764 reviews) | 2 reviews |
| Multiplayer | Multi-player, Online Co-op, Shared/Split Screen Co-op | Single-player only |
| Developers | Valve | Hizuki |
Side by side
- Both are Adventure games on Steam.
- Portal 2 (2011) is 12 years older than Size story (2023).
- Size story is currently ~80% cheaper on Steam than Portal 2 (1.99 USD vs. 9.99 USD).
- Portal 2 has co-op; Size story does not.
- Portal 2 is Deck Verified on Steam Deck; Size story has no Deck rating yet.
Portal 2 vs Size story — FAQ
- Should I play Portal 2 or Size story first?
- If you want chronology, Portal 2 (2011) came out before Size story (2023). 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 Size story 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 Size story have multiplayer like Portal 2?
- No. Portal 2 supports multiplayer on Steam (Multi-player, Online Co-op, Shared/Split Screen Co-op), while Size story is listed as single-player only.
- Does Portal 2 run on Steam Deck?
- Yes — Portal 2 is rated Deck Verified by Valve. Size story doesn't have a Deck rating yet, so its Deck behaviour is currently unverified.