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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. 668+ moves, 151+ monsters, grid-based worlds, turn-based battles, and a complete save system — out of the box.

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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. 668+ moves, type effectiveness, status conditions, abilities, items, capture mechanics, and pluggable AI — all wired together and ready to use.

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151+ Monsters Included

Ship with a full roster of original monsters, each with stats, types, abilities, evolution chains, and sprites. Create unlimited custom species with the Monster Creator wizard.

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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 addon. PvP battles, trading, guilds, housing, economy, leaderboards, and anti-cheat — 18 services ready to deploy.

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AI Art Generation

Generate monster sprites, overworld characters, and tilesets directly from the Unity editor using PixelLab, Nano Banana 2, or OpenAI. Batch generate sprites for your entire roster.

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Choose Your Tier

From indie prototypes to commercial MMORPGs, there is a tier for every project.

Lite
$99

Core engine DLL, 151 monsters, public SDK API

Basic
$299

Lite + Essentials Importer, Art Studio, editor tools

Pro
$499

Basic + Quest System, advanced AI, full editor tooling

Online
$999

Pro + Nakama MMORPG layer with 18 online services

Source
$2,499

Full C# source code with architecture documentation

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
  • SDK API for DLL-tier customization