Monster Capture Engine (MCE)
The Monster Capture Engine (MCE) by OpenMon.IO is a production-ready Unity engine for building monster capture RPGs. Whether you are creating the next Temtem, Coromon, or Cassette Beasts, MCE provides the complete foundation so you can focus on what makes your game unique.
What Can You Build?
MCE is designed for any game in the monster capture genre:
- Single-player RPGs with grid-based overworlds, turn-based battles, and full progression systems.
- MMORPGs with real-time world sync, PvP matchmaking, trading, and guilds (with the Online addon).
- Fan games imported directly from RPG Maker Essentials projects (with the Essentials Importer).
- Hybrid games that blend monster capture with other genres using the modular architecture.
Feature Overview
| Feature | Details |
|---|---|
| Monsters | 151+ included entries, unlimited custom species, forms and variants, breeding, egg hatching |
| Moves | 668+ moves with Physical / Special / Status categories, full Gen V+ damage formulas |
| Battle System | Turn-based with 15+ modular components, wild / trainer / PvP modes, battle items, capture mechanics |
| Battle AI | Pluggable strategy pattern with Random, Effective, and ML-Agents-based AI included |
| Evolution | 30+ evolution types: level, item, trade, friendship, location, time-of-day, stat-based, and more |
| Type System | Full type effectiveness chart, dual types, customizable via Type Chart Editor |
| World | Grid-based tile movement, multi-map transitions, bridges, waterfalls, slippery tiles, ledges |
| Encounters | Configurable encounter tables, time-of-day, terrain-based (grass, water, cave, fishing) |
| Events | CommandGraph visual scripting for NPCs: dialogs, branches, shops, quests, cutscenes, warps |
| Save System | JSON serialization with slot-based saves, versioning, auto-save |
| Quest System | 11 objective types, 6 reward types, prerequisites, time limits, repeatable quests |
| UI | Complete UGUI system: battle HUD, menus, bag, dex, shops, dialog boxes, options |
| Audio | BGM, BGS, SE, ME channels with AudioManager |
| Localization | Multi-language support with runtime language switching |
| Rendering | URP shaders, time-of-day lighting, weather effects |
| SDK | Clean public API surface (IMonsterCaptureEngine) for DLL-tier users |
SKU Tiers
MCE is available in multiple tiers to fit your project and budget:
| Tier | Price | Includes |
|---|---|---|
| Lite | $99 | Core engine DLL, 151 monsters, Inspector configuration, public SDK API, no source code |
| Basic | $299 | Everything in Lite + Essentials Importer, Art Studio, additional editor tools |
| Pro | $499 | Everything in Basic + Quest System, advanced AI, full editor tooling |
| Online | $999 | Everything in Pro + Nakama MMORPG layer (18 services), PvP, trading, guilds, housing |
| Source | $2,499 | Full C# source code, architecture documentation, modification rights |
Which tier should I choose?
- Building a small game or prototype? Start with Lite.
- Importing an existing RPG Maker Essentials project? You need at least Basic.
- Building a commercial single-player game? Pro gives you the full toolset.
- Building an online multiplayer game? Online adds the complete Nakama backend.
- Need to modify engine internals or deeply customize systems? Source is for you.
Quick Links
- Installation Guide -- Get MCE running in your Unity project in minutes.
- Create Your First Monster -- Build a custom monster from scratch.
- Set Up Your First Battle -- Configure an encounter zone and test combat.
- CommandGraph Events -- Create NPC behavior with visual scripting.
- Public API for DLL Users -- Extend MCE without source code access.
- Source Architecture -- Deep dive into engine internals (Source tier).
Requirements
- Unity 6 LTS (6000.3.x or later)
- Universal Render Pipeline (URP)
- Windows, macOS, or Linux editor
- Target platforms: Windows, macOS, Linux, Android, iOS, WebGL