iO
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About iO
iO is a physics platformer where you control a ball and change its size to affect its speed and weight. Use these changes to build momentum, solve puzzles and reach each level's exit as quickly as possible.
Levels and medals
The game has 225 levels, including the extra-tough Impossiball Levels. You can earn bronze, silver and gold medals, with gold available to win in every level.
Physics mechanics
Levels use mechanics including inverted gravity, portals, tricycles and movable objects. Leaderboards in every level let you race against friends and other iO players.
Frequently asked questions
The best price for iO is $0.61 at Difmark. That is 87% less than on Steam, where it costs $4.99. 9 shops have an offer that activates in your country.
Some are. This page only shows offers that activate in your country; offers for other regions, or with no stated region, are left out. To see the offers for another country, change your country at the top of the page.
Every key we list activates on Steam. Redeem the key there and iO stays in your library for good.
Yes, with a small risk. Publishers create keys to sell in other shops, which is why a key can cost less than in the official store, and once you activate it the game is yours to keep, just like a store purchase. On average 1–2% of keys fail, so check the shop's buyer protection before you buy: the official store does not refund keys bought elsewhere.
The minimum requirements for iO are: Windows XP, 2 GB RAM, 250 MB storage. It also runs on macOS. The recommended specs are in the System requirements section.
No. iO is a single-player game.
Mostly, yes. Valve rates iO as Playable on the Steam Deck: it runs, but may need some manual setup.
Buy iO 87% cheaper than on Steam.
iO is available for 87% less in shops such as Difmark, YUPLAY, or Gameseal.
Steam lets publishers create keys to sell in other shops. Once you activate a key, the game is yours to keep, just like a store purchase.
Disclaimer: CD keys have an inherent 1–2% average failure rate. Check the shop terms for buyer protection info. Steam offers no buyer protection for keys bought in other shops and doesn't refund them.
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