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OpenMon Documentation

The Monster Capture Engine for Unity

Build monster-catching RPGs, Temtem-like MMOs, or entirely original monster capture games with a production-ready Unity engine. Grid-based worlds, turn-based battles and a complete save system out of the box, plus a separate MIT Licensed Demo (667 species, 640+ moves) to learn from.

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Everything You Need

MCE provides a complete foundation for monster capture games. Focus on what makes your game unique.

Complete Battle System

Turn-based battles with 15+ modular components. Type effectiveness, status conditions, abilities, items, capture mechanics, and pluggable AI — all wired together and ready to use.

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MIT Licensed Demo: 667 Species

Learn the engine on a complete demo project: 667 species with stats, types, abilities, evolution chains and sprites, wired into battles and a playable world. Build your own roster with the Monster Creator wizard. The demo is MIT-licensed. All of its assets belong to Nintendo and cannot be distributed. DMCA contact: legals@lastremix.com.

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Grid-Based World

Tile-based movement system with collision, encounters, bridges, waterfalls, ledges, and seamless cross-map transitions. Built on Unity Tilemaps for easy map authoring.

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Visual Event Scripting

CommandGraph is a node-based editor for creating NPC events, dialogs, shops, quests, and cutscenes. No code required — connect nodes and configure in the Inspector.

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Online MMORPG Layer

Add real-time multiplayer with the Nakama-powered Online layer (Pro, Source and Studio editions). PvP battles, trading, guilds, housing, economy, leaderboards, and anti-cheat — 18 services ready to deploy.

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Map Editor in the Scene View

Open any map scene and the editor switches on: a toolbar, a tileset palette and a status bar right in the Scene View, for an RPG Maker-style workflow without leaving Unity.

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Built for Unity 6

MCE is built on Unity 6 LTS with the Universal Render Pipeline. It targets Windows, macOS, Linux, Android, iOS, and WebGL.

  • Unity 6 LTS (6000.3.x)
  • Universal Render Pipeline (URP)
  • Zenject dependency injection
  • Conventional Commits workflow

Ready for Production

MCE is not a tutorial or a prototype. It is a commercial engine with thousands of lines of battle-tested code, editor tooling, and documentation.

  • Full save/load system with versioning
  • Multi-language localization
  • Editor tooling for non-programmers
  • Public SDK API for your own C# code (Indie and above)