This is quite a strategic game that requires a lot of thinking.

While other reviews are quite disappointing, the important points are as follows: First, know the characteristics of each unit. → Each has varying ranges, attack speeds, and power, so if you don't place them strategically, your shield will be depleted, and in the worst case, you might lose. Of course, upgrading units by leveling them up at home is also essential. Next are the buffs during level-ups. → Basically, you can follow the good marks on the right, but prioritize buffs with higher rarity as much as possible. If you only have green ones, it's highly recommended to watch an ad to refresh. And above all, if you're playing this game for free, watching ads is a must. In fact, the game's developers have designed it with this in mind, so you absolutely cannot clear it without purchasing ad-free or by continuously watching ads every time.