The Original game of Castle Defense; Accept no imitations!
Defend Your Castle takes place on a grassy plain surrounded by invaders. You are the commander of your castle, and at your disposal is an invisible hand for picking up the enemy and flinging them mercilessly to their death. It is a good thing you've got that, at least, for the invaders you face are crafty and employ many different types of soldiers in their quest for your castle.
Attacks come at dawn. The Barbarian invaders arrive in relentless waves until nightfall, when they return to their camp... or sleep in your castle, if you are not capable of defending it. Luckily, however, the game provides a few other tricks up your invisible sleeve. For instance, the capability to convert enemy troops into soldiers to help you defend your walls. You can also purchase upgrades and repairs for your castle, and miraculously, they can be administered overnight, while the barbarian hordes are snoring in their camps!