With access to the engine that powered Crysis 2, as well as the CryEngine 3 Sandbox level editor, we've been able to breathe perfectly lit life into our artistic (and non-commercial) endeavor. If we were trying to impart some educational information in a classroom, developer Crytek wouldn't charge us a cent either. (It's a competitive stance, considering the Unreal Development Kit is free as well. Both require users to pay a licensing fee if the project becomes commercial.)
Though this SDK has helped us to quickly arrange terrain, AI and textures, the central "narrative" -- as they say -- of Fears for Spheres has been years in the making.
Embark on the tragic journey of Borb, the reflective amnesiac sphere, cursed to wander/wonder through a fantasy realm in search of his true purpose. "Who am I?" he asks a traveler in passing. "I know not," comes the reply, "but you have shown me much of myself today. Such is your thankless existence."