ClassiCube is a cross-platform voxel-based sandbox game engine inspired by Minecraft Classic. It features a modular architecture with clear separation of concerns between rendering, input, audio, networking, world management, and game logic systems. The engine supports an extensive range of platforms from modern desktop and mobile systems to legacy consoles like PS1, PS2, Dreamcast, GBA, and many others through platform-specific implementations behind common abstractions. Key features include block placement/breaking, inventory management, chat system, texture packs, lighting (classic and fancy modes), entity rendering, and multiplayer networking.