Classic City Builder Kit

Framework for Grid-Based Strategy

Developing a grid-based city builder requires managing a complex web of interconnected systems. The Classic City Builder Kit addresses this by providing a core framework that handles the fundamental requirements of the genre, such as buildings, walkers, layers, and connections. The system is designed to facilitate games that focus on evolving housing and monument construction, though it remains flexible enough for various grid-based configurations.

By providing a pre-built foundation, the kit allows developers to bypass the initial hurdles of setting up resource management and structural hierarchies. This is achieved through a modular buildings system and a dependency container that keeps the architecture extendable with minimal external dependencies. The package includes a collection of 2414 assets, including original low-poly building models and 2D sprites sourced from Kenney and pixel32.

Editor-Driven Workflow and Setup

The kit utilizes an editor-based workflow intended to simplify the initial stages of production. A dedicated Setup Wizard is included to help developers transition from an empty scene to placing buildings and roads in a matter of seconds. This workflow is tailored for a range of experience levels, offering a starting point for those new to the genre while providing time-saving shortcuts for experienced developers.

To assist in the creation of custom systems, the kit includes a step-by-step guide for building a 2D city builder from scratch. It also provides a series of diverse demonstration projects that showcase the framework’s versatility. These demos include a 3D city builder, a 3D colony sim, a 2D tower defense project, and a 2D city simulator, illustrating how the core mechanics can be adapted to different perspectives and gameplay loops.

Walker Logic and Pathfinding

One of the more intricate aspects of the city-building genre is the management of walkers—NPCs that navigate the city to perform tasks or provide services. The kit features a flexible walker system with configurable pathfinding modes. These walkers handle various urban functions, from providing services to residents to managing risks within the city grid.

Recent updates to the system have refined these behaviors, addressing specific logic issues such as homeless walkers properly identifying full houses and emigration walkers loading correctly. The framework also includes a cooldown system for risks and grace periods for services, ensuring that the management layer of the game remains balanced. For projects requiring high performance, the kit supports object pooling to prevent walker duplication during scene reloads.

Data Persistence and Technical Specifications

Data management is handled through a consistent saving mechanism using JSON. This approach ensures that the state of the city, including building placement and walker progress, is preserved across sessions. The framework is built for Unity version 2021.3.45 and above, with the latest iterations focusing on asset reserialization and fixing exceptions related to walker descriptions and movement playgrounds.

The package also includes utility assets such as UV-mapped road models and town collection test scenes to assist in environment layout. The inclusion of a minimal dependency container ensures that developers can build their own custom systems on top of the existing framework without being locked into a rigid structure.

Technical Foundation for Production

The Classic City Builder Kit functions as a structural starting point for games requiring grid-based placement and resource flow. By integrating service layers, risk management, and item distribution into a single framework, it provides a centralized method for handling city-building mechanics. The system is particularly suited for developers looking to implement classic housing evolution mechanics or complex colony simulation logic within the Unity engine.