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About City Defense Z
City Defense Z blends daytime planning with nonstop night battles. During daylight you gather resources, place and merge buildings, trade, select NPCs, launch expeditions, and train soldiers. When darkness falls, you defend the city using positioned troops, airstrikes, and boosters.
Progress carries over between runs via research points and permanent upgrades, letting each attempt feel stronger. Leaderboards track who defends best, while Steam features like achievements and cloud saves round out the single‑player experience.
01 / THE GUIDE
Daytime Resource Management
Daytime is for building the foundation of your defense. Factory Buildings produce the main resource needed for construction, while Ammunition Buildings generate ammo for soldiers, defenses, and special attacks. Barracks Buildings train new soldiers each cycle, and House Buildings raise the population limit so your army can grow.
You can also trade resources, choose NPCs for expeditions, and position troops strategically before night arrives. All of these actions set the stage for the upcoming combat and influence how well you can hold the line.
- Prioritize Factory and Ammunition Buildings early to ensure a steady flow of resources and ammo.
- Balance population growth with soldier training to avoid a bottleneck in army size.
02 / THE GUIDE
Merge‑Based Building System
Buildings and soldiers automatically merge when placed smartly on the grid. This mechanic lets you combine lower‑level structures into higher‑level ones without manual upgrades. Merging streamlines expansion and can free up space for additional defenses.
The system applies to both structures—like factories and barracks—and units, encouraging careful placement to maximize the benefits of each merge. Efficient merging can accelerate resource production and strengthen your forces before nightfall.
- Arrange buildings in clusters to trigger merges quickly.
- Watch the grid for open slots that enable larger merges.
03 / THE GUIDE
Nighttime Defense Options
When night falls, the city faces constant combat. You can call in airstrikes and collect boosters to power up the defense units you placed during the day. These tools help recover from a strategy that isn’t working.
Even if a run is lost, the night phase offers ways to turn the tide, giving you a chance to survive longer and earn more research points for future runs.
- Save boosters for critical moments when enemy pressure spikes.
- Use airstrikes on clusters of enemies to maximize damage.
04 / THE GUIDE
Permanent Meta Progression
Research points earned each run feed into 13 research trees, offering over 150 meta upgrades. These upgrades persist between runs, letting you tailor long‑term strategy. Choose paths that match your preferred playstyle, whether focusing on offense, defense, or resource efficiency.
The permanent upgrades create a sense of growth, so each new attempt feels stronger than the last, encouraging experimentation with different upgrade combinations.
- Identify which research tree aligns with your dominant strategy before spending points.
- Mix offensive and defensive upgrades for a balanced approach.
05 / THE GUIDE
Leaderboards & Achievements
City Defense Z tracks performance on Steam Leaderboards, letting you compare scores with other players. Steam Achievements add extra goals beyond the core gameplay.
These features give players long‑term objectives and a way to showcase skill, while Steam Cloud ensures progress is saved across sessions.
- Aim for achievement milestones that align with your upgrade path for smoother progress.
- Check the leaderboard regularly to gauge how your strategies rank.
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