Choose iO
Choose iO if it's currently about 50% cheaper on the Steam Store. iO launched in 2014.
iO vs Great Marble Adventure
iO and Great Marble Adventure both land in Action, Indie, Racing 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, Racing on Steam. iO (2014) is 8 years older than Great Marble Adventure (2022). Great Marble Adventure scores higher on Steam reviews (100% positive) than iO (83.1% 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 Great Marble Adventure
Choose Great Marble Adventure if you want a Strategy and Casual experience. On Steam, it's the newer release (2022) and ships with the modern feature baseline. Great Marble Adventure launched in 2022.
Both iO and Great Marble Adventure sit in Action, Indie, and Racing on Steam and both list Steam Leaderboards, 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
 iO |  Great Marble Adventure | |
|---|---|---|
| Released | 2014 | 2022 |
| Genres | Action, Indie, Racing | Action, Strategy, Indie, Casual, Racing |
| Platforms | Windows, macOS, Linux | Windows |
| Steam Deck | Deck Playable | Deck Verified |
| Price | 4.99 USD | 9.99 USD |
| Steam reviews | 83.1% positive (59 reviews) | 100% positive (16 reviews) |
| Multiplayer | Single-player only | Single-player only |
| Developers | Gamious | NaCl586 |
Side by side
- Both share Action, Indie, Racing on Steam.
- iO (2014) is 8 years older than Great Marble Adventure (2022).
- Great Marble Adventure scores higher on Steam reviews (100% positive) than iO (83.1% positive).
- iO is currently ~50% cheaper on Steam than Great Marble Adventure (4.99 USD vs. 9.99 USD).
- Steam Deck: iO is Deck Playable, Great Marble Adventure is Deck Verified.
iO vs Great Marble Adventure — FAQ
- Should I play iO or Great Marble Adventure first?
- If you want chronology, iO (2014) came out before Great Marble Adventure (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 iO and Great Marble Adventure similar?
- They overlap on Action, Indie, Racing 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.