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iO

iO

iO is an abstract physics platformer about size and speed. Grow bigger and smaller in order to solve some of the trickiest puzzles. Reach the exit as quickly as possible and grab a gold medal as your reward!

Released Dec 5, 2014 Developer Gamious Platforms Windows · Mac · Linux IndieActionRacingPhysicsPuzzle
View on Steam ↗ $4.99 (US · as of 2026-09-26)

What players say

Steam review score and the most-helpful voices, which may include critical ones. Score via Steam as of 2026-09-26 · quoted reviews as of 2026-05-13.

80.9%positive235 reviews
Recommended · 0 found this helpful

“iO, developed and published by Gamious, is a minimalist physics-based platformer that builds its entire experience around a single, elegantly simple idea: controlling a ball that can dynamically change its size to manipulate speed and momentum. While the concept may initially…”

— a player, Steam review · 12 hrs played
Read more reviews ↗

Achievement stats

Global completion rates across all Steam players — a data view of how far people actually get. Source: Steam official stats · as of 2026-09-26.

39achievements
4.9%median completion
2.3%rarest: Impossiball ride
52.4% of players 36.7% of players 34.8% of players 32.7% of players 32.3% of players 31.3% of players 30.5% of players 28.5% of players 22.5% of players 19.0% of players 14.9% of players 13.0% of players 10.0% of players 8.8% of players 7.1% of players 6.5% of players 6.4% of players 6.1% of players 5.0% of players 4.9% of players 4.6% of players 4.2% of players 4.2% of players 3.8% of players 3.7% of players 3.7% of players 3.6% of players 3.6% of players 3.2% of players 2.9% of players 2.6% of players 2.6% of players 2.6% of players 2.6% of players 2.5% of players 2.4% of players 2.4% of players 2.4% of players 2.3% of players 52.4% 0% most earned rarest
Almost everyone has
52.4%Lets get this party started — Unlock the full game
36.7%First Blood — Win a gold medal
34.8%10 down, 140 to go — Play 10 levels
Rarest badges of honor
2.3%Impossiball ride — Collect a medal in all Impossiball levels
2.4%Impossiball play — Complete all Impossiball levels
2.4%Incrediball ride — Collect a medal in all Incrediball levels

Price tracking

US-region pricing (USD), sampled twice daily by our own tracker since 2026-08-12. Steam prices vary by region — always confirm your local price on Steam.

$4.99current · sampled 2026-09-26 21:12 UTC
$4.99lowest since tracking began2026-08-12
US4.99 USD
EU4.99 EUR
UK4.29 GBP
Australia7.50 AUD
Canada6.49 CAD
Japan580 JPY
Brazil16.99 BRL
China22.00 CNY

Regional prices at last sample, in local currency — Steam sets each region's price independently.

China≈$3.3 Brazil Japan Canada US Australia UK EU≈$5.7

Cheapest → most expensive, converted to USD at ECB reference rates (2026-09-25). Relative comparison only.

$0 $5 $10 08-12 08-21 08-30 09-08 09-17 09-26

Latest official news

Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.

Oct 17, 2018
iO update incoming!

We finally found the time, resources and nerve to fix some things that should have been fixed a long time ago. Without going into too much detail about why we couldn't have fixed it earlier, here's th

Oct 08, 2015
iO is back. Free update LIVE now.

iO is back! http://www.gamious.com/wp-content/uploads/2015/10/ioisback.png The update is LIVE. It's been a long time coming, but it's here now and we are quite happy with it. Hopefully you are too! Th

Oct 08, 2015
iO is back. Free update LIVE now.

iO is back! http://www.gamious.com/wp-content/uploads/2015/10/ioisback.png The update is LIVE. It's been a long time coming, but it's here now and we are quite happy with it. Hopefully you are too! Th

Oct 02, 2015
FREE update incoming next week!

iO is back, bigger and better than ever! At then end of next week iO will get a huge update. This update includes a big facelift for the game, a lot of new content, a few new mechanics and an extra ha

Oct 02, 2015
FREE update incoming next week!

iO is back, bigger and better than ever! At then end of next week iO will get a huge update. This update includes a big facelift for the game, a lot of new content, a few new mechanics and an extra ha

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Screenshots

Official Steam store screenshots — click any shot to enlarge.

Facts & details

From the Steam store record, snapshot 2026-05-13.

GenresAction, Indie, Racing
Player tagsIndie · Action · Racing · Physics · Puzzle · Puzzle-Platformer · 2D · Platformer (SteamSpy community voting)
FeaturesSingle-player · Steam Achievements · Full controller support · Steam Trading Cards · Steam Cloud · Stats · Steam Leaderboards · Remote Play on TV
LanguagesEnglish, French, Italian, German, Spanish - Spain, Dutch, Polish, Portuguese - Portugal
ControllerFull support
Achievements39
Minimum system requirements (PC)

Minimum: OS *: Windows XP+ Memory: 2 GB RAM Graphics: DX9 (shader model 2.0) capabilities DirectX: Version 9.0 Storage: 250 MB available space