Best Alternatives to Project Substitute Arena

Unity MCP

Runtime: npx

Connects AI agents to Unity Editor and compiled games for automation, code generation, testing, and runtime debugging.

SpriteCook

Runtime: npx

Generate game sprites and assets from text prompts for game development.

Godot MCP

Runtime: npx

Controls Godot projects through MCP, including editor launch, project execution, debugging, scene operations, and UID management.

Gearboy MCP Server

Runtime not confirmed

MCP server for Gearboy Nintendo Game Boy / Game Boy Color emulator

Geargrafx MCP Server

Runtime not confirmed

MCP server for Geargrafx PC Engine / TurboGrafx-16 emulator

Gearcoleco MCP Server

Runtime not confirmed

MCP server for Gearcoleco ColecoVision emulator

Suigar TypeScript SDKs

Runtime: npx

MCP server and MCP App for building and inspecting Suigar transactions on Sui.

Gearsystem MCP Server

Runtime not confirmed

MCP server for Gearsystem Sega Master System / Game Gear / SG-1000 emulator

Fairseal MCP Server

Runtime: npx

Verifiable entropy, provably-fair games, and receipt verification for AI agents (FairSeal API).

GameFork MCP

Runtime: Remote (SSE)

Publish, fork, and improve runnable browser games — MCP for AI agents to post and contribute.

ChiR24 Unreal MCP

Runtime: npx

Control Unreal Engine to browse assets, import content, and manage levels and sequences. Automate…

Unreal MCP Ue4

Runtime: npx

UE4.27 MCP server for controlling Unreal Editor sessions over Python Remote Execution.