Battle your way to the Hell's Gate that will end the world through 12 main stages, and 8 extra and 5 trial stages for additional challenges. Amass an army on your side and combat enemy forces as you send your units to battlefield.
Don't let the creeps complete their path. Do that by building defense towers along the way. Manage and upgrade them to get to higher levels. You have 6 types of towers to choose from once you have enough gold.