This book constitutes the refereed proceedings of the 4th International Conference on Entertainment Computing, ICEC 2005, held in Sanda, Japan in September 2005.

The 47 revised papers, 3 poster papers, and 5 demonstration papers presented together with one keynote paper were carefully reviewed and selected from 110 submissions. The papers are organized in topical sections on interactive digital storytelling, graphics, advanced interaction design, social impact and evaluation, seamful and seamless interfaces, body and face, robots, music and sound, mixed reality and mobility, education, virtual reality and simulation, and theory.