SonicGDK (short for 3D Sonic Games Development Kit) is a codebase, a collection of source codes, which allows anyone to create 3D platformer video games based on the Sonic the Hedgehog franchise. It can be freely modified and is integrated with the UDK, providing you with a modern game engine in which to develop your game. Unreal Development Kit (UDK) is the free edition of Unreal Engine 3, a complete professional development framework used to create games on the PC.

Get UDK and the source code and get started; or just download and play any of the following demos made with SonicGDK:

   

   

Also, check out what other people have done in these videos:

   

   

   

   

   

       

       

• Name: SonicGDK Tech Demo (Packaged Release 6)
• Credits: Xaklse (maker) and Digimaks, Dekrayzis, Appo, SefirothDB, Damizean, Tee, Candescence, BlazeHedgehog, Resel, The Taxman, Chimera, Andrew75, TimN, P3DR0, Mercury, SymphonicGames (contributors).
• System requirements:
  • Windows XP SP2, Windows Vista or Windows 7; or Mac OS X
  • 2.0 GHz single-core processor
  • 2 GB system RAM
  • Shader Model 3.0 compatible graphics card (Nvidia GeForce 8600GT or better, ATI Radeon X1950Pro or better)
• Download:
  • Windows: .EXE
  • Mac OS: .DMG
• Description: This technical demonstration has a big playground used to showcase and test most of the available features that SonicGDK adds to Unreal Engine. Players should try to ride the loopings, pick up each type of monitor, explore the underwater area, reverse the gravity of the world, play the special stage and collect the seven Chaos Emeralds... Installation instructions and description of controls are included in the readme file.

       

       

• Name: Green Hill Paradise (Beta 1)
• Credits: SuperSonic68 and TheActualKK.
• System requirements:
  • Windows XP SP2, Windows Vista or Windows 7
  • 2.0 GHz multi-core processor
  • 2 GB system RAM
  • Shader Model 3.0 compatible graphics card (Nvidia GeForce 8600GT or better, ATI Radeon X1950Pro or better)
• Download: .EXE
• Description: This is Green Hill as you've never seen it before! There's no boundaries, no limits, nothing stopping you but your own imagination. Go full-speed along the sides of cliffs, freely explore the vibrant hills, plains and valleys, climb across wide plateaus and treacherous mountain ranges, navigate the deep and varied Elemental Canyon, and finish it off with a dramatic climb to the summit of a stark mountain. Run wild and free through a beautiful environment with no limits on where you can go or how you can get there. Experience the thrill of Sonic's speed unbounded, and realize with a smile that this is like nothing you've ever experienced from a Sonic game before. It is at the same time the old and the new, the classic and the modern, seemlessly brought together in an entirely new way.