* The more kills you make the better the weapons the agents will bring like shotguns and phazers.
* The more kills you make the more agents you have to fight at a time.
* Once you hit a new level search for a randomly placed healing kit somewhere in the building.
* You can jump on top of enemies from above floors that will also hit them.
* Throwing a desk does more damage than throwing a garbage can.
* If your computer is slow it will automatically reduce quality. The lowest will remove special effects.
Use guns and swords, slam through floors and walls, throw office furniture and everything else you can get a hold of to defeat as many agents as you can. They get smarter, stronger and get armed with katanas, shotguns to phazers.