Castle Defense King is an Android game developed by mobirixsub that belongs to the strategy subcategory. It is a free-to-play game that features easy and simple strategy defense, cute heroes, and various monsters. In the game, your goal is to prepare endless enemy waves by reinforcing castles, heroes, and soldiers.

The game offers reinforcement tips to help you prepare your defense base. You need to reinforce walls and soldiers first and try to combine unique heroes. Finally, you need to reinforce your tower and magic to challenge the conquer war. As the tower level increases, the magic becomes stronger. There is also a hero that uses a skill every time you use magic.

The game provides three kinds of spells that make it easier to defend: Repair magic, Magic Bomb, and Ice storm. Repair magic repairs the wall's health, Magic Bomb drops magic bombs to attack enemies, and Ice storm slows down monsters that smash in blizzard.

Castle Defense King features massive enemy waves, a conquer war challenge to the limit, and the ability to compete against players worldwide with enemy wave clear. It is supported offline without WIFI and on low-spec and tablet devices. The game also supports achievements and a leaderboard.