Update: Added quality control to options menu, reworked flamethrower towers to reduce lag, and increased the sound effect volume.
You are a network security engineer in the year 3000. You have a limited budget to protect your companies server from wave after wave of malicious viruses. You're only tools are virtual towers you can place along the network path to destroy the viruses before they reach your firewall.
With 50 levels, 7 different types of towers, and 4 maps to choose from you can expect hours of your precious time wasted. Enjoy.