You have been called by your dark master to invade and dethrone the lord of hell. Sounds easy right? You may make your way through many of the catacombs of hell and come out at the end, each have different difficulty. The map starts out slow but becomes more intense as you are continually ambushed and thrown into deadly puzzles. There are several neat secrets, see if you can find them. Upgrades are unit and location based. Have fun, and watch your back