FOC Game Engines were developed to simplify creating Fully On-Chain Games (FOCG), addressing issues developers faced when building games like Dark Forest, which struggled with tools designed for DeFi rather than gaming. FOC Game Engines now streamline FOCG development by providing modular libraries and tools that focus on core game logic instead of infrastructure. Major FOC Game Engines fall into two categories: public goods (open to all) and proprietary engines by game studios. Modular libra...