Microsoft has started developing new Xbox controllers for mobile gaming. Prototype images reveal how the gamepads might attach to the sides of your iPhone and iPad for portable play.

The controllers would be ideal for Microsoft’s upcoming Project xCloud service, which will allow players to stream Xbox games to their smartphones and tablets.

Two of Apple’s biggest competitors revealed they’ll debut their own streaming games services at about the same time as the launch of Apple Arcade.

This isn’t the first we’ve heard of Microsoft xCloud and Google Stadia, but their developers have revealed new details about pricing and release dates.

Microsoft is gearing up to release a software development kit that will allow Android and iOS developers to integrate Xbox Live features into their games.

The SDK, which will be officially confirmed by Microsoft next month, will also be available to Nintendo Switch developers. It will make Microsoft the first console-maker to open up its platform to third-party systems.