WIth the WASD keys and the mouse, kill all your enemies.
Join us on Twitter and Facebook!
After all the bitching and moaning about our Disqus comments system we’ve bowed to your pressure and have implemented Facebook comments as an option too. Now go and make us proud and show us which comments are boss.
Also, learn to spell! It's INTRUSION.
the "WOW" tag fits this game perfectly... It's over 4 years old...