iO
Fair · Action · 2014
Steam Deck PlayableThe verdict
NO RUSH.
Fair at $4.99. Buy it if you want it.
- Length
- 3.1h 7.3h to 100%
- Value
- $1.61/hr
- Reviews
- 81% of 235 positive
Watch this gameOne alert at a price you pick.
Buy now or wait
Next discount: likely in the Winter Sale, Dec 17 to Jan 4. Calls like this were right 83% of the time in a backtest over 70 weeks.
Discounted in 6 of its last 8 seasonal sales. Last cut ended 9 days ago.
- Next sale
- Winter Sale, Dec 17 to Jan 4
Sources: IsThereAnyDeal, Valve.
What drives the score
How to read this
Grades run S to D, read from the buyer's side. ▲ marks a lift, ▼ a drag or a dock, ? an input we do not have, • a fact this genre's score does not use. How the grades work
About the game
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!
Minimum specs
Minimum on the Steam store: 2 GB of memory, DX9 (shader model 2.0) capabilities, 246 MB of storage. Runs on Windows, macOS, Linux.
The value story
Across all 57 discounts in the 12 years tracked, the median cut is 70 percent, about 9 weeks apart. Today it is at full price, and its last discount ended 9 days ago.
Value puts it in the top 10 percent of the games it competes with. It is better reviewed than 78 percent of its genre. On the same math Marble It Up! Ultra ($29.99, scores 71) and DDNet (free, scores 74) are the better buys, and they are the games it most resembles.
More about iO
The main story runs 3.1 hours. Doing everything runs 7, 2.4 times as long.
The drop-off
52% start to 2% rarestNo achievement in this game marks the ending, so there is no finish rate. The curve runs from the most-unlocked achievement to the rarest, and its shape is where players stop. Steam global achievements
What players say
Imagine a game where the character is just a ball the whole time. A ball that isn't even bouncy and can't jump. Consider how difficult it is to implement any platforming that isn't simply clunky and awkward with such a limitation. Now let's think about 99% of platformers. How very annoying and limited would they be if they didn't allow changing directions in midair? It is completely unrealistic, yet omnipresent. I...
2 more reviews, 1 not recommended
A minimalistic puzzle platformer game where the main concept is the ability to shrink or grow your ball in order to navigate through the levels. Gameplay is fun and is broken into levels which gradually get tougher. The background music is very well done. Really easy game to learn but hard to master. Works well on keyboard+mouse or controller. Overall a very fun little abstract game to add to your collection.
It was a peaceful enough three hours, and some of the puzzles took a few minutes, but many of them took practically no time at all... it's not really a puzzle if you just have to hold down the Move Right key, for example. As it stands, therefore, although I finished it, I wouldn't really recommend it. I was mostly playing it while holding conversations and watching TV, so it's not like it requires desperate focus.
Steam reviews, mixed to its ratio and rotated daily. Opinions are theirs.
No data upstream: critic score (Metacritic).
Cite this score
iO scores 54/100 on the BANG Score (fair value) as of Oct 19, 2026. The BANG Score rates what a game is worth for the money. Via Steam BANGERS. https://steambangers.com/game/324070/ioReviews set the ceiling, and price against real length moves the BANG Score inside it. How it works, and where it is weak → Steam reviews as of Sep 30, price as of Oct 18. A number here look wrong? Tell me and I will check the inputs.