iO

About

iO is a physics platformer in which you control a ball. By growing or shrinking the ball you can influence its speed and weight.

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8
Based on
102 reviews
Country Compatibility:
Languages:
Developer:
Gamious
Engine:
Unity
Release date:
05 December 2014
Recent Steam reviews:
Not specified
All Steam reviews:
Very Positive (102)

Game features

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Description

iO is a physics platformer in which you control a ball. By growing or shrinking the ball you can influence its speed and weight. Use these mechanics to gain momentum and make your way through the levels. Toy with the laws of physics, solve the puzzles and reach the exit as quickly as possible. Can you win the gold medal in all levels?

Features:

  • 225 challenging levels to solve, including the extra tough Impossiball Levels.
  • Crafty mechanics like inversed gravity, portals, tricycles and movable objects.
  • Leaderboards in all levels to race against your friends and other iO players.
  • Bronze, Silver and Gold medals to earn.
  • Dual Stick controller support.

Recommended system requirements

minimum*

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

recommended*

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

User reviews

tuxdelux
Not recommended | 26 Jul 2018
14 min played

Played the game on an ubuntu desktop, where I had a bunch of technical issues. On some ubuntu versions, there was an unmovable mouse cursor in the center of the screen. On ubuntu 19.10, the fullscreen mode made the game

Helpful: 17
∩∩4r|<
Recommended | 04 Oct 2019
20.6h played

Apart from a couple of achievement unlocking/registration issues - here , something I did in order to unlock the 2 remaining, 'frozen' achievements - almost a 10/10 for me; I couldn't approve this level . More in-depth?

Helpful: 3
Retalio
Recommended | 19 Jan 2025
11.3h played

Though this game is a bit challenging, it is fun to play and figure out how to reach the end. Even with the simple mechanics, there are a lot of tricks available to take advantage and beat the level. ++

Helpful: 0
Achrotone
Not recommended | 30 Sept 2021
9h played

It pains me to give this review, but it's necessary to convey my honest experience with this game. Hopefully you take the time to read through this. In a nutshell, iO is the spiritual successor of the flash game wOne,

Helpful: 3
xxadonisxx
Recommended | 07 Apr 2026
12.3h played

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

Helpful: 0
Obey the Fist!
Not recommended | 27 Apr 2020
4.7h played

This is a fairly lazy 2D retro physics/platformer/puzzle game with a "shrink/grow" gimmick mechanism. Roll a size-changing ball around minimalist/neon levels and question where you went wrong in life that you're

Helpful: 1