iO Free Download

Fit check

Is iO worth it for you?

We tell you who should skip it, too.

Play it if you…

Good fit

Puzzle-platformer fans who want physics-based movement
Time-focused players who enjoy chasing medal rankings
Competitive players who want level-specific leaderboards

Skip it if you…

Saves you a refund

Players seeking a story-driven adventure rather than repeated physics puzzles
Players who prefer relaxed pacing instead of fast exits and medal chasing
Players looking for combat-focused action or vehicle racing

Drafted from Steam store data with AI and reviewed by an editor · How we write fit checks · Report an error

Our take on iO

Instead of using platforming mainly for traversal, iO makes changes in size, speed, and weight the central puzzle language. Its structure also replaces a conventional finish-line focus with repeated attempts to improve completion times and medal results.

What is iO?

iO is a physics platformer centered on a controllable ball whose size changes its speed and weight.

These properties affect momentum and support puzzle solving across 225 levels, including the especially difficult Impossiball stages. Levels include mechanics such as reversed gravity, portals, tricycles, and movable objects. The goal is to reach each exit quickly and earn bronze, silver, or gold medals. Leaderboards record results for every level, allowing races against friends and other iO players. The game also supports dual-stick controllers.

How iO plays

01Size-based physics: Changing the ball’s scale modifies its movement properties, including speed and weight.
02225 puzzle levels: The level set includes extra-difficult Impossiball stages.
03Physics obstacles: Stages use reversed gravity, portals, tricycles, and objects that can be moved.
04Medal scoring: Fast level completions can earn bronze, silver, or gold awards.
05Level leaderboards: Results can be compared with friends and other players for each level.
06Dual-stick support: The game accepts dual-stick controllers.

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Picked by overlapping fit notes and genres, not an editorial comparison.

iO: platforms & release

Is iO worth it?

It is worth it if: puzzle-platformer fans who want physics-based movement. Skip it if: players seeking a story-driven adventure rather than repeated physics puzzles.