About This Demo

20250804 Current DEMO Version Feature Overview:​​

1、Allows players to freely configure pre-game settings: adjust game difficulty (max enemy squad size), number of player-controlled heroes (1-3), and total enemy count (1-100) to facilitate understanding of game mechanics.

2、Supports unlimited-resource DIY tunnel and trap construction for testing underground systems.

3、Players can equip weapons and ammunition in the warehouse.

4、Hotkeys: 1/2 switch primary/secondary weapons; 3activates Provocation skill to lure enemies.

5、Shelters are available for housing populations and food supplies—must protect them from enemy discovery/attacks during battles.

6、Victory: Eliminate all enemies. Defeat: All player units perish.

7、Discover more details through gameplay or refer to tutorial videos.

8、Welcome to playtest and share valuable feedback!

Future Full Version Overview:

1931-1945: Their Childhood - Tunnel Warfare  

——Build Your Underground Great Wall in a Dynamic WWII Sandbox, Experience Historically Inspired Strategic Survival  

[V] Freely Construct Tunnel Networks  

[V] Realistic Enemy AI Launching Dynamic Raids  

[V] Village Management × Tech Tree Evolution  

[V] Data-Driven Combat Systems  

As an underground resistance commander, you'll defend against escalating enemy sweeps through tunnel engineering, resource allocation, and guerrilla tactics. Each assault dynamically adapts to your threat level - your tech choices unlock diverse combat styles from Trap Masters to Sniper Specialists. When invaders come, calmly direct your militia: split enemy forces using tunnel networks, protect civilians and food supplies, and repel brutal aggressors until final victory... Remember, every decision determines your village's survival!  

▌Core Experience  

• Infinite Tactical Combinations: Connect underground nodes to build unique defense systems  • Dynamic War Sandbox: Enemies adapt troop composition and strategy to your strength  

• Historical Immersion: Authentic 1940s Street fighting battleground  

• Multi-Dimensional Development: Train militia classes (Engineer/Sniper/Demolition Expert)  

• Endurance Challenge: Protect villagers and granaries through seasonal cycles until 1945  

"This is more than combat—it's the legacy of wisdom and perseverance. Can you keep the flame of hope alive through the raids?"  

Join us to build your own Underground Great Wall!  

Mature Content Description

The developers describe the content like this:

The game contains frequent depictions of:
Firearms combat with lethal outcomes
Explosive takedowns
Melee weapon eliminations
Additionally, protagonists regularly use improvised medical items for healing.