MDPro4 Sacred Book

MDPro4 / YGOPro / Rush Duel scripting

Start with one card. Learn the engine around it.

Follow the guided curve for a first card. When you already know the engine, jump straight to an exact API call or search every local script for a proven pattern.

Start LearningWrite A CardSearch ScriptsLearn Rush Duel

first activated effectc55144522.lua

local e1=Effect.CreateEffect(c)
e1:SetCategory(CATEGORY_DRAW)
e1:SetType(EFFECT_TYPE_ACTIVATE)
e1:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
e1:SetCode(EVENT_FREE_CHAIN)
e1:SetTarget(s.target)
e1:SetOperation(s.activate)
c:RegisterEffect(e1)

Guided pathLearnRead one effect, build in small steps, wire a real card, then debug with structure.Exact callsAPIGenerated functions and constants from the local MDPro4/YGOPro data.Real cardsExamplesFeatured local scripts with detected API calls and source links.Find patternsScript ExplorerSearch by card text, type, category, ID, script path, or function use.

Beginner Curve

New to Lua? Take the short Lua Essentials lesson first.

01Read a card file02Study local patterns03Build small effects04Write your first card05Trace activation flow06Debug safely

Follow the curve from left to right. The first-card lesson hands off to card data and script wiring before the activation-flow and debugging stages.

Choose Your Branch

Activation flowChains and timingFilters and GroupsTarget or select cardsMove cardsScript SpellsScript TrapsContinuous effectsSummon proceduresArchetypesClient promptsCount limitsRush Duel scriptingMaximum and Rush summonsNew engine and script patternsCheck your progress

Reference

• Function reference
• Constant reference
• Featured card examples
• Script Explorer
• Rush helper reference
• Rush card examples

Credits & Support

Created and documented by Senator John.

If Sacred Book helped you learn scripting, build a card, or find the right local pattern faster, consider supporting the work on Ko-fi.

Documentation inspiration

Credit to the YGOPro Scripting Wiki and Glitchy for wiki notes and scripting explanations that helped inspire this learning reference.

Upstream YGOPro projects

MDPro4 builds on the YGOPro ecosystem, including Fluorohydride/ygopro, Fluorohydride/ygopro-core, and Fluorohydride/ygopro-scripts.