Tower defense games are a popular genre of strategy games, where the objective is to defend your territory or a specific location from waves of enemies. In this particular tower defense game, the enemies are skeletons and wizards, and your goal is to stop them from reaching your castle.

The game starts with a set amount of resources that you can use to build towers and other defensive structures. As you progress through the game, you can earn more resources by defeating enemies, which you can then use to upgrade your towers or build new ones.

There are different types of towers that you can build, each with their own unique abilities and strengths. For example, you might build a tower that shoots arrows at enemies from a distance, or a tower that sprays fire on groups of enemies that come too close.

As you progress through the levels, the enemies become stronger and more difficult to defeat, so you'll need to continuously upgrade your towers and strategize to come up with new ways to defend your castle.

Overall, this tower defense game provides a challenging and exciting gameplay experience that will keep you engaged for hours as you battle against skeletons and wizards to protect your castle and defend your territory.