Your mission in this tower defense game is to protect the computer against harmful spam and viruses. You do this by placing your turrets along multiple pathways to prevent the viruses from reaching the CPU. Enemies will come in various forms including viruses, trojans, worms and spam. To defend your system you will need to purchase defense towers from the shop and place them on to the grid. You can buy upgrades for existing towers by clicking on them. Use YOUR MOUSE to control the game. Have fun! .