Microsoft's Lift London studio has revealed that it is working on four free-to-play game titles for "tablet, mobile and connected platforms" but details on those games were not revealed.
...of Windows 10, more Windows 10, and some other stuff
Windows 10 review: Microsoft goes back to the future
Windows 10 'Service Release 1' coming this month
These ten Lumias will be first to get Windows 10 Mobile
The Redmond Report - Episode 4: Windows 10 gets hit by lightning