● Left 4 Dead 2

Your audience controls the horde

Connect TikTok Live, Twitch, Kick, YouTube or Starvios and turn every gift into a Tank, a Witch, a horde or a weapon for your team — in real time.

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33Commands
4Categories

How an event travels

From your viewer's gift to the on-screen effect, in about a frame.

TikTok / Twitch

A gift, reward or follow from your audience.

OverInteractive

The app receives the event and translates it into a game command.

Plugin (SourceMod)

Receives the command over a local bridge and runs it in the match.

Left 4 Dead 2

The Tank, horde or weapon shows up in the campaign instantly.

No code

Everything is handled from the app. No programming or editing game files.

01

Install the app

Download OverInteractive for Windows and install it in seconds.

02

Connect your platform

Link your TikTok Live, Twitch, Kick, YouTube or Starvios account from the app.

03

Install the mod

One click installs SourceMod and the OverInteractive plugin into your Left 4 Dead 2 folder.

04

Host and survive

Open Left 4 Dead 2, host a co-op campaign and start your interactive stream.

What they can do

Your audience runs the infection

Effects ready to map to gifts, rewards or chat commands.

Infected

Threats

Your audience drops the Specials and hordes right on top of the team.

  • Spawn Tank, Witch, Hunter, Smoker and more
  • Panic events and mega hordes on demand
  • Waves of common infected

Survivors

Team

Blessings and misery for the whole squad.

  • Heal, hurt or slap everyone
  • Temporary invincibility, speed or low gravity
  • Incapacitate or revive the team

Arsenal

Loot

Hand out weapons and consumables to the whole team.

  • Medkits, pills, adrenaline and defibrillators
  • Molotovs, pipe bombs and bile jars
  • Magnum, rifle, grenade launcher, chainsaw and katana
PLATFORMS

Connect where you stream

TikTok, Twitch, Kick, YouTube and Starvios. Connect one or several: triggers work the same wherever the event comes from.

TikTok

Native · Recommended

Direct connection to your TikTok Live from the app. No extra software or accounts.

  • Login with built-in WebView2
  • Gifts, follows, likes, chat and share
  • No external dependencies

TikFinity

Bridge

If you already use TikFinity for alerts or overlays, OverInteractive links over WebSocket and reuses your session.

  • Coexists with your existing overlays
  • WebSocket localhost:21213
  • Same event coverage as native

Twitch

OAuth + EventSub

Login via Device Code Flow and real-time event subscriptions. Map channel point rewards, subs, bits and follows.

  • Channel points by rewardId
  • Subs, bits, follows, raids
  • Safe for your account — official OAuth

Kick

OAuth + Webhooks

OAuth login and official events over webhooks. Map Kicks, subs and follows from your Kick channel.

  • Kicks, subs and gifted subs
  • Follows and chat
  • Works alongside TikTok, Twitch and YouTube

YouTube

Just your @handle

Connect your YouTube live by typing your @handle, no sign-in needed. Map Super Chats, Super Stickers, memberships and chat messages.

  • Super Chat and Super Sticker by amount
  • New members, milestones and gifted memberships
  • Chat and emotes

Starvios

Just your channel

Connect your Starvios live by typing your channel. Map Starvies, subs, follows, raids, Star Showers and chat messages.

  • Starvies by amount
  • Subs and gifted subs
  • Chat, follows and raids
COMPATIBILITY

Works with your Steam copy

Powered by SourceMod + MetaMod:Source, the standard Source plugin stack. The plugin uses Left4DHooks to spawn the infected.

Good to know

  • The app installs SourceMod and the OverInteractive plugin for you.
  • The app launches the game with -insecure (required to load plugins); if you open it from Steam, add -insecure to the launch options.
  • Effects run in the match you host (co-op listen server).
  • Removable anytime: uninstalling from the app removes the OverInteractive plugin. SourceMod and MetaMod:Source stay in the folder; on their own they don't change the game.
  • Some effects are still being tuned per game build.
Setup

Ready in 4 steps

The app installs SourceMod and the OverInteractive plugin into your Left 4 Dead 2 folder — both fully removable.

  1. 01

    Open OverInteractive

    The app auto-detects your Left 4 Dead 2 install on Steam.

  2. 02

    Install the mod

    Click Install on the Left 4 Dead 2 card. The app sets up SourceMod and the plugin.

  3. 03

    Host a campaign

    Open Left 4 Dead 2 and start a co-op game as host so the plugin loads.

  4. 04

    Connect and go live

    Map gifts and rewards to commands in the app and start your stream.

See the full step-by-step guide →

Command list

Everything your audience can trigger

Commands ready to map to gifts, rewards or chat commands.

Spawn Tank

Infected

Spawns a Tank next to a random survivor.

Spawn Witch

Infected

Spawns a Witch next to a random survivor.

Spawn Witch Bride

Infected

Spawns a Witch Bride (fire variant).

Spawn Hunter

Infected

Spawns a Hunter that pounces the survivors.

Spawn Smoker

Infected

Spawns a Smoker that drags a survivor away.

Spawn Boomer

Infected

Spawns a Boomer that vomits and calls a horde.

Spawn Charger

Infected

Spawns a Charger that rams the survivors.

Spawn Spitter

Infected

Spawns a Spitter that pools acid.

Spawn Jockey

Infected

Spawns a Jockey that rides a survivor.

Common Horde

Infected

Spawns a group of common infected.

Stackable

Panic Event

Director

Forces the AI Director to unleash a horde.

Mega Horde

Director

A massive extended horde.

Heal Team

Survivors

Heals every survivor.

Hurt Team

Survivors

Damages every survivor.

Slap Team

Survivors

Slaps every survivor (damage + knockback).

Incapacitate

Survivors

Downs a random survivor.

Revive Team

Survivors

Revives every downed survivor.

Invincible Team

Survivors

Survivors can't take damage for a while.

10s

Speed Boost

Survivors

Survivors move faster for a while.

12s

Slow Team

Survivors

Survivors move slower for a while.

10s

Low Gravity

Survivors

Survivors get low gravity for a while.

12s

Give Medkit

Weapons

Gives every survivor a first aid kit.

Give Pills

Weapons

Gives every survivor pain pills.

Give Adrenaline

Weapons

Gives every survivor an adrenaline shot.

Give Defibrillator

Weapons

Gives every survivor a defibrillator.

Give Molotov

Weapons

Gives every survivor a molotov.

Give Pipe Bomb

Weapons

Gives every survivor a pipe bomb.

Give Bile Jar

Weapons

Gives every survivor a bile bomb.

Give Magnum

Weapons

Gives every survivor a magnum pistol.

Give Assault Rifle

Weapons

Gives every survivor an M16 rifle.

Give Grenade Launcher

Weapons

Gives every survivor a grenade launcher.

Give Chainsaw

Weapons

Gives every survivor a chainsaw.

Give Katana

Weapons

Gives every survivor a katana.

REQUIREMENTS

Requirements

SystemWindows 10 or 11
GameLeft 4 Dead 2 (Steam)
AppOverInteractive (free)
PlatformTikTok Live, Twitch, Kick, YouTube or Starvios

Frequently asked questions

Your stream, in your audience's hands

Download OverInteractive and let your audience run the horde with you.

Download free