iO is a physics-based platformer developed by Gamious for Xbox One. The game puts you in control of a ball, which you can grow or shrink to influence its weight and speed. With these mechanics, you must navigate through 225 challenging levels, including the extra tough Impossiball levels. The game offers crafty mechanics like inversed gravity, movable objects, tricycles, and portals that add to the game's complexity.

The game also features leaderboards in all levels, allowing you to compete against your friends and other iO players. You can earn Bronze, Silver, and Gold medals as you progress through the levels. The dual-stick controller support makes it easy to control the ball, and the game's physics engine is top-notch, making the gameplay smooth and enjoyable. Overall, iO is a fun and challenging physics-based platformer that will keep you engaged for hours.