Feature List

Current EA Version Features (As of 20250923):

1. Hero Upgrade Mechanism: Heroes gain experience points for each hit, repulse, kill, or headshot. Upon reaching a threshold, they automatically level up. Leveling increases key attributes that affect accuracy, carrying capacity, movement speed, attack speed, health points, and significantly enhances offensive capability.

2. Enemy Escape Mechanism: Individual enemy units possess a morale value. Injuries or deaths to themselves or other squad members reduce this individual morale. When morale drops to zero, it triggers a desertion. Enemy units also gradually lose morale and may eventually flee if they fail to locate player heroes or shelters during prolonged searches.

3. Overall Enemy Morale Mechanism: The enemy force has an overall morale value, which is key to winning each engagement. Every enemy unit killed or that flees reduces this overall morale. When it reaches zero, the entire enemy force retreats.

4. Provocation Mechanism: Feel like the enemy is retreating too easily while you still have fight left? Use the Taunt function. It will enrage the enemy, increasing their overall morale and causing them to launch attacks again.

5. Friendly Reputation Mechanism: Each enemy kill or repulse increases the village's Reputation. This leads to better side quests and rewards, but also attracts stronger and more numerous enemy attacks.

Planned Features for Next Version (Target Release: October):

1. Proactive side quests during strategic phases.

2. A revamped and more effective tech tree.

3. Enemy reinforcement calling and assembly mechanisms.

4. Optimization of enemy search and entry mechanics into tunnel openings.

5. More realistic linkage for weapon consumption/durability.

6. Improvements to weapon production and loot drop mechanisms.

20250913 DEMO Version Feature Overview:​​

1. Double-click the ground or a target while controlling the hero to activate sprint mode, increasing movement speed by 1.5x but generating noise within a certain range that attracts enemy attention.

2. Added behavioral sound mechanisms: enemies will track the player’s team based on sounds generated from actions, including sprinting, shooting, and melee kills.

3. Hero auto-counterattack can be enabled in the main menu. When activated, heroes will automatically return fire when attacked by enemies.

4. helters: Building underground shelters allows hiding population and food during combat phases, providing better protection against enemy attacks.

5. Medical Rooms: Constructing medical rooms unlocks jobs for producing health potions. These potions can be used in the warehouse hero interface during the strategy phase to heal injured heroes.

6. Armories: Building armories unlocks jobs for producing weapon parts, mines, bullets, caltrops, and heavy machine guns. Defensive structures can only be built after producing these resources, unlike previous versions where resources were unlimited.

7. Command Centers: Building command centers unlocks research jobs to generate tech points for upgrading the tech tree (though the tech tree is not fully implemented yet).

8. Mini-map improvements: Real-time synchronization between the main and mini-map camera positions, clearer mini-map icons, enemy survival count statistics, and visibility of shelter locations and statuses.

9. Strategy-phase passive side missions: Resource income is calculated each time the phase advances, but various disasters and incidents may affect earnings, reflecting the harsh setting.

10. Ammo reloading: Heroes and enemies are limited by weapon magazine capacity. Automatic reloading occurs when ammo is depleted, though players can manually reload.

11. Hit probability pie chart: When selecting a hero and switching weapons with keys 1 or 2, aiming at an enemy displays a pie chart showing hit probability (orange) and critical hit rate (red), helping players decide whether to attack or move closer.

12. More realistic grenade mechanics: Pressing G initiates grenade aiming, which can currently only be canceled by pressing Esc.

13. Tunnel entrance numbering: Ground and underground tunnel entrances are now numbered, making it easier for players to locate positions and design their underground networks.

14. New failure condition: Game over if all population in shelters is destroyed.

15. New critical mechanics: During the strategy phase, population will starve if food is insufficient. Additionally, before each battle, the system checks player resources. If the total food capacity across all shelters is less than the current food stock, the excess will be removed. Build more shelters underground to avoid losses!

16. Enemy patrols: Enemies patrol courtyards in squads and will enter tunnels if they discover entrances. Hope players can hold out!

20250804 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!

Demo20250707 version game function introduction

1、Allows real-time DIY tunnels and traps during combat with no resource limits, enabling players to test the tunnel system freely.

2、Lets players freely set the number of hero characters (1-3) and enemy units (1-100) before battle, helping players experience the core combat mechanics.

3、Introduces hero luring skills, weapon noise attraction, enemy pursuit mechanics, and cone-shaped vision for players to explore key combat systems.

4、Simplified win/lose conditions: Victory by eliminating all enemies, defeat if all allies are wiped out.

Enemy auto-pathfinding AI.

About the Game

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!