Author's note:

"Sigma is a mini-adventure. As a traveller who's awoken inside a strange compound, and with nothing but a letter to guide you, you must explore the environments with a hope to discover both your identity and that of a enigmatic creature or organisation known only as Sigma".

Features:

360 Degree Panoramic Locations
3D Rendered Environments
Intuitive Controls
Music and Sound Effects
Brain-Teasing Puzzles
Mysterious Story Line

System Requirements:

Pentium 3 600 MHZ
128 MB RAM
2MB GRAPHICS CARD
Sound Card
Windows 98b or above
DirectX 9.0b or above