In Castle Defense, you get to be a brave knight protecting your super cool castle! You build walls and set up traps to stop sneaky monsters from getting in. You can even use magic spells to zap them away! Each level is like a new adventure, and you can earn shiny coins to upgrade your weapons and build better defenses. There's a big map with different lands to explore, and the monsters get stronger, so you have to be clever and quick! Team up with your friends, or go solo, but remember: protect the castle at all costs! Knights, assemble!