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 libraries in these engines enable developers to reuse code, making FOCG development faster and easier.

MUD and Dojo are leading FOC Game Engines. MUD, released in Q3/2022, aims to serve as an "operating system" for EVM-based apps. Initially developed by Lattice, MUD uses an Entity Component System (ECS) for game structuring, transitioning in its V2 release to a flexible data model like SQLite. This model broadens its utility beyond FOCG to other blockchain applications.

Dojo, launched in February 2023, is Starknet-focused and features a STARK-based proving system, making it ideal for complex games on Starknet. Its proof system, despite its size, is efficient in computation, offering advantages over other engines.

Other notable engines include World Engine by Argus, Keystone, Paima Engine, and Archetype Engine. World Engine by Argus, which includes L2 and L3 architecture with ECS and low block times, offers full-stack FOCG solutions, particularly for non-EVM games, and supports popular engines like Unity.

With FOC Game Engines like these, developers can better focus on game creation, marking a significant step in the evolution of blockchain-based gaming.