Click on the empty tiles to the left to construct buildings, use them to defend your base from enemy and to produce units to attack them. All structures are upgradeable, which makes either them or units they produce more powerful.
Destroy the enemy base while defending yours. You can build turrets to defend your base and units to attack the enemy's. The twist of the game is that you can evolve as well as unlock new units and defense means.
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.