"A highly addictive brain challenging game that will make you feel smarter as you finish each stage."
"After playing iO for about an hour we came to a conclusion that if the video games Tron and Super Monkey Ball made sweet, sweet love then iO would be the result."
"One of the most inventive brain puzzlers I have played for quite a while, all the laws of physics are here, and so will I be - for quite a while."
I Have A Gadget
"iO provides an entertaining romp that’s sure to test both your reflexes and brain power."
True PC Gaming
"iO is a smart physics puzzler that requires brainpower and a lot of trial and error."