iO
Physics puzzle platformer about changing size to control a ball's momentum
Gamious · Released Dec 5, 2014
- Reviews
- Very Positive
- 81% of 113
- Recent reviews
- Not enough recent
- Players
- 0
- daily peak, Oct 31, 2026
- Steam Deck
- Playable
- Last update on Steam
- 8 years ago
- Oct 17, 2018
What is iO?
In this single-player 2D physics puzzle platformer, you roll a ball through 225 levels, changing its size to alter its speed and weight. You build momentum to reach each exit, solving puzzles involving reversed gravity, portals, and movable objects.
For you if...
- +you enjoy experimenting to find solutions to tricky levels
- +you like chasing medals and improving your completion times
Not for you if...
- −you prefer forgiving platforming over precise timing and movement
What players say
81% of 113 reviews are positive
Players praise the varied puzzles and the tricks possible with simple controls. Some find those controls awkward when precise movement is required.
Screenshots and trailer
iO system requirements
Minimum: DX9 (shader model 2.0) ca…, 2 GB RAM, 0.2 GB of disk space.
As published by the developer.
Can my PC run iO?
Tell us your graphics card once and every game page will answer this for you.
Set up my PC →Minimum
- OS
- Windows XP+
- Graphics
- DX9 (shader model 2.0) capabilities
- Memory
- 2 GB RAM
- Storage
- 250 MB available space
- DirectX
- Version 9.0
Recommended
- OS
- Windows XP+
- Graphics
- DX9 (shader model 2.0) capabilities
- Memory
- 2 GB RAM
- Storage
- 500 MB available space
- DirectX
- Version 9.0
Does iO have co-op or multiplayer?
No: single-player only, no multiplayer modes declared.
Does iO run on Steam Deck?
Playable Playable: it runs on Steam Deck with some adjustments.
- The launcher or setup tool may need the touchscreen or virtual keyboard
- All functionality is accessible with the default controller configuration
- Shows Steam Deck controller icons
- In-game text is legible on Steam Deck
- Default graphics settings perform well on Steam Deck
PC version details
- DRM
- None declared on Steam
- Controller
- Full controller support
- Platforms
- Windows, macOS, Linux
- Achievements
- 39
- Steam features
- Cloud saves, Family Sharing, Trading cards
- Languages
- Text only: English, French, Italian, German, Spanish - Spain, Dutch, Polish, Portuguese - Portugal.
Does iO use AI-generated content?
No AI-generated content is disclosed on the game's Steam page.
Self-reported by the developer under Steam rules: it covers AI content that ships in the game, not tools used to make it. Steam page checked on Oct 27, 2026. How to filter AI games on Steam
Tags
Recent updates
- Oct 17, 2018 · iO update incoming!
- Oct 8, 2015 · iO is back. Free update LIVE now.
- Oct 8, 2015 · iO is back. Free update LIVE now.
- Oct 2, 2015 · FREE update incoming next week!
- Oct 2, 2015 · FREE update incoming next week!
