1. When the game starts, monsters keep pouring in.
2. Press the pull button on the right to produce units and place them in the optimal position to defeat the monsters.
3. Units are randomly assigned grades, and if youre lucky, very powerful units can be generated.
4. The units grade can be differentiated through the color of the shadow by clicking on the unit.
5. As the monsters pile up, the life decreases and if it reaches zero, you lose.
6. If the boss monster is not killed within the specified time, you lose.
7. Collect gems through boss defeat, watching ads, and missions to upgrade skills.
8. Clicking the information window menu at the bottom is also a good choice to understand the game.