Creating game mods in Lua: from idea to launch

Why Lua? 🧩
Simple syntax, high speed, flexible integration into engines and a huge community. Lua was created to expand games — it's no surprise that WoW, Garry's Mod, Roblox, and dozens of other projects love it.

1. From concept to technical specifications: focus the idea ✍️

Formulate a goal 🎯

• What are we changing? UI, rules, items, events, enemies, quests, tools.

• For whom? Solo player, raid, server sandbox, map creators.

• What does success look like? Short use case: “Understand the boss mechanics in 10 seconds” or “Build a logic diagram in a minute”.

Mini ToR per page 📄

• Features (3–5 points)

• Restrictions (platform, PvE/PvP, server/client)

• Resources (icons, fonts, sounds)

• Readiness criteria (what should work 100%)

2. Where mod lives: structure and files 🧱

3. First code: “Hello, mod!” ⚡

WoW: slash command and event

-- MyAddon.lua
local addonName = ...
local function hello()
  print("|cff4aa3ff[MyAddon]|r Hello, Azeroth! ✨")
end

-- /hello в чате
SLASH_MYADDON1 = "/hello"
SlashCmdList["MYADDON"] = hello

-- Реакция на вход в мир
local f = CreateFrame("Frame")
f:RegisterEvent("PLAYER_ENTERING_WORLD")
f:SetScript("OnEvent", function()
  print("|cff4aa3ff[MyAddon]|r Welcome to the game! 🚀")
end)

Mini-manIFEST (.toc)

# # Interface: <WoW client version number>
## Title: MyAddon
# # Notes: Simple hello mod
## Author: You
MyAddon.lua

Garry's Mod: Catch the player's message

-- lua/autorun/server/sv_myaddon.lua
hook.Add("PlayerSay", "MyAddonHello", function(ply, text)
  if string.lower(text) == "!hello" then
    ply:ChatPrint("[MyAddon] Hello from the server! 🌐")
    return true -- блокируем сообщение в чат (опционально)
  end
end)

4. Feature design: small steps 🐾

• UI mini-feature (WoW): timer/buff icon, sound signal, panel backlight.

• Gameplay mini-feature (GMod): chat command, simple entity, mini-tool for spawning objects.

• Development cycle: one feature → test → refactor → next step.

5. Debugging and testing 🔍

WoW

• /reload for quick UI restart

• Enable error display (in options/through BugSack addon)

• Break the logic into functions and modules, log print()

Garry’s Mod

• Developer console, lua_openscript, map restart

• Separate client (cl_*.lua) and server (sv_*.lua)

• Check permissions and sandbox restrictions

6. Publication and support 🚀

1. Name and description: briefly about the essence and benefits, 1–2 screenshots.

2. Installation: one clear instruction “copy the folder here and restart”.

3. Versioning: v0.1.0 → v0.2.0 (new features), patches — v0.1.1.

4. Feedback: issues/discussions, quick fixes of critical bugs.

7. Common mistakes and how to avoid them 🧯

• "All at once" — break it down into mini-releases, don't accumulate technical debt.

• No logs — add quiet print() or your own logger.

• Client/server mixing (GMod) — keep the code separate, check where it is executed.

• Hard dependencies — avoid global magic, inject config and constants.

In Codice we make programming training fun and easy to understand: we have interesting courses with tasks that help you improve your skills step by step.

And we also have an active Telegram channel, where we discuss cool ideas, share experiences and analyze tasks together — learning becomes not only useful, but also fun.

Lua mods are a short path from an idea to a real game effect. Start with a small feature, keep the structure clean, log everything important, and release updates iteratively. This way you will turn a “cool idea” into an addon that will be used by hundreds of players — and then a thousand.

Which mod would you like to make — for WoW UI or for the sandbox in GMod? What are you planning to add first? 🙂