Version 4.0 was released in 2012 and enabled game developers to create stunning gameplay and animations. The primary updates to the game engine for this release were:

• A new animation system called Mecanim
• Real-time shadows (for all platforms)
• Support for DirectX 11 rendering
• Updated the Shuriken particle system, including support for world collision
• Added new deployment platforms:
  • Linux
  • Adobe Flash
• Support for cross-platform dynamic fonts