Thats right a first person shooter in 96kb.
http://theprodukkt.com/

The system requirements are a little beefy but still very impressive for 90kb

- A 1.5GHz Pentium3/Athlon or faster.
- 512MB of RAM (or more)
- A Geforce4Ti (or higher) or ATI Radeon8500 (or higher) graphics card
supporting pixel shaders 1.3, preferably with 128MB or more of VRAM.
- Some kind of sound hardware
- DirectX 9.0b