Defense Designer is a free online tower defense game where you place and upgrade towers to protect your castle from waves of increasingly tough enemies. You control every aspect of your defense layout, deciding where to build, what to upgrade, and how to manage your resources before each wave hits. Smart planning separates survivors from those who get overrun.

The game gives you multiple tower types to work with, each suited for different threats. Some handle fast, light enemies while others are built to slow down or tank heavier units. Walls add another layer of strategy, letting you funnel enemy paths so your towers deal maximum damage. Resources are limited, so you need to prioritize every coin spent. Waiting too long to upgrade a key tower can cost you the entire run, and rebuilding mid-wave is rarely an option.

If you enjoy castle defense games, strategic shooting games, or classic tower defense challenges, Defense Designer delivers solid gameplay without any fluff. It's a great pick for fans of 1-player strategy games who want something that actually requires thinking. Players searching for free tower defense games with no download, browser-based castle defense games, or single-player shooting strategy games will find exactly what they're looking for here. Jump in, design your defense, and see how many waves you can survive.