Version 2.0 had several impressive features, including better support for projects made for the Windows platform. This release also improved the web player compatibility across platforms.

Engine updates included better graphic processing performance with the support of Microsoft's DirectX and OpenGL. The terrain engine was also introduced in this release, as was the ability for real-time soft shadows and networking. 

The Unity Asset Server was also introduced in Version 2.0. This is an asset and version control system for teams working on Unity projects. 

The major features of Unity 2.0 included:

• Terrain engine
• Video playback
• DirectX 9.0 renderer
• Networked multiplayer games
• Real-time dynamic shadows
• Game GUIs
• Web player streaming and compression
• Unity Asset Server
• Physics enhancements
• Scripting enhancements
• Water feature

After this, there were incremental releases. Most notably, Version 2.5 was released in 2009 and included cross-platform support so the Unity game engine could run on both Mac and Windows computers.