iO

iO

Gamious · December 5, 2014 · Indie, Action, Racing, Physics, Puzzle

Buy the iO key for Steam from Gameseal at $0.67 — the cheapest of 7 stores we compare.

PC
Very Positive81% · 235
Best price 46 Good deal
$0.67-87%
lowest tracked $0.36
Gameseal Buy at Gameseal

Prices last checked

More games under $5 →

Where to buy iO — official stores

Steam
Steam
Standard Edition · Steam
$4.99
Buy
Humble Store
Humble Store
Standard Edition · Steam
$4.99
Buy
Nuuvem
Nuuvem
Standard Edition · Steam
$7.99
Buy

Cheapest iO keys — keyshops

Keyshops are third-party marketplaces — keys are resold and can be region-locked or a different edition. Check the listing's region & edition before buying.

Gameseal
Standard Edition · Steam
$0.67
Buy
Kinguin
Standard Edition · Steam
$0.69
Buy
Eneba
Standard Edition · Steam
$0.88
Buy
Driffle INC
Standard Edition · Steam
$4.13
Buy

Some store links are affiliate links — playze may earn a commission at no extra cost to you. It never changes the price you pay, and the cheapest confirmed price is always shown in the Best price box above.

iO price by region

iO costs £0.59 in the United Kingdom, €0.60 in Europe (EUR), $0.67 in the United States, $0.67 in Georgia (USD), zł3.80 in Poland, CA$6.49 in Canada, A$7.26 in Australia, NZ$7.39 in New Zealand and R$15.99 in Brazil right now.

Cheapest iO offer in each region, in local currency
RegionBest priceOfficial storeKey shopStores
United Kingdom £0.59 −84% £3.59 £0.59 5
Europe (EUR) €0.60 −87% €4.69 €0.60 7
United Statesyour region $0.67 −87% $4.99 $0.67 7
Georgia (USD) $0.67 −80% $3.29 $0.67 7
Poland zł3.80 −82% zł20.59 zł3.80 5
Canada CA$6.49 CA$6.49 — 3
Australia A$7.26 A$7.26 — 3
New Zealand NZ$7.39 NZ$7.39 — 2
Brazil R$15.99 R$15.99 R$19.55 4

Each row is a real price from that region's own stores, not a currency conversion, so the figures are not directly comparable. Switch regions in the header to shop the one you buy in.

Screenshots

About iO

✦ AI summary

Control a ball you can grow and shrink to manipulate speed and weight through 225 physics-based puzzle platformer levels filled with gravity inversions, portals, and devious obstacles. Race against friends on leaderboards and chase gold medals by mastering momentum, timing, and creative use of the game's physics mechanics.

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!

iO — game info

Platforms
Windows, macOS, Linux / SteamOS
Steam Deck
Playable
Player modes
Single-player
Controller
Full controller support
PC Game Pass
Not included

What Steam players say

Recent verbatim reviews from Steam — separate from playze.io community reviews below.

✦ AI summary

iO is a minimalist physics-based platformer built around resizing a ball to navigate obstacles, with players praising its clever level design, satisfying core mechanic, and surprising depth despite its simplicity. Common complaints center on the game's difficulty and the concern that it has too many levels which some find repetitive, though this largely depends on individual tolerance for puzzle-platformers. Players generally suggest the game is worth trying if the core concept appeals to you, particularly during sales.

Recommended Jul 8, 2024
Fun addicting game when bored
1 found this helpful
Recommended Apr 7, 2026
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 seem modest, the game quickly reveals a surprising level of depth, transforming that lone mechanic into a layered and demanding test of precision, timing, and spatial awareness. It’s the kind of design that thrives on restraint, proving that complexity doesn’t always require a multitude of systems—just one well-executed core. The moment-to-moment gameplay is where iO truly distinguishes itself. Players must constantly adjust the size of the ball to navigate slopes, gaps, and obstacles, carefully balancing weight and velocity. Enlarging the ball increases its mass, making it easier to maintain momentum and resist sudden disruptions, while shrinking it allows for quicker acceleration and sharper control. This interplay creates a dynamic flow that feels both intuitive and challenging, as every action directly influences how the ball behaves within the environment. The physics are impressively consistent, which i…
Recommended Jun 12, 2025
The levels are pretty clever and the physics tolerable.
Recommended Jan 19, 2025
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. ++
Recommended Jun 17, 2024
‎
Not recommended May 1, 2024
A unique puzzle game. Like all puzzles games, this one has way too many levels and it's boring. Though let it be known I hate puzzles games, unique or otherwise. Honestly, just watch the trailer. If it makes you say, "gee, that looks fun!" (or some semblance of that) then buy it. You'd probably enjoy it.

Community reviews

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