To build and upgrade towers in City Defense, you need to first gather enough resources. You can find the building menu by clicking on the base or tower icons on the screen. Select the tower you want to upgrade and use the available resources.

You can place various defensive obstacles such as walls, spikes, and traps to hinder the enemy's advance. These obstacles can be built using the resources you have collected and can be upgraded for better effectiveness.

Effective resource management is crucial in City Defense. Focus on gathering resources from your base and using them strategically to build and upgrade towers and defensive obstacles. Prioritize upgrading key defenses that will protect your base from the most dangerous enemies.

Yes, you can deploy different types of troops in City Defense. Each type of troop has its own strengths and weaknesses. Some troops are better at dealing with specific enemy types, so it's important to choose the right combination based on the current wave of enemies.

As the game progresses, enemy attacks become more challenging. To overcome these challenges, continuously upgrade your towers and defensive obstacles. Adjust your strategy based on the enemy composition and deploy appropriate troops to counteract their strengths.

Yes, City Defense includes a comprehensive tutorial that guides new players through the basics of building, upgrading, and defending. The tutorial covers essential gameplay mechanics and provides tips for effective strategy development.

Yes, you can customize your base layout in City Defense to suit your preferred defensive strategy. Experiment with different placements of towers and obstacles to find the most effective configuration for protecting your base against enemy attacks.

If your base gets destroyed in City Defense, the game ends. To avoid this, focus on building strong defenses and managing your resources efficiently. Practice strategic planning and upgrading your defenses to withstand the increasing difficulty of enemy attacks.