How to stop exploiters in your Roblox game

If your game gets players, it will get exploiters. They give themselves infinite cash, fly across the map, kill everyone in a server or crash it. Exploits ruin the game for honest players, break your economy and can wreck your ratings in a weekend. You can't make a Roblox game impossible to exploit, but you can make exploits pointless, and that's what this guide is about.

The one rule: never trust the client

Roblox's client has anti-tamper protection, but you should design as if an exploiter has full control of their own client. They can:

• Run their own scripts on their machine.
• Read and change anything in their LocalScripts and client-side state.
• Fire any RemoteEvent or RemoteFunction they can see, with any arguments, as often as they like.
• Move their own character freely, because the client controls its own character's physics.

They can't directly change things on the server, such as other players' data, your DataStores or server-side values, because changes made on the client don't replicate to the server. Almost every real exploit comes from the server believing something the client told it.

Design remotes as if an attacker is calling them

RemoteEvents are where most vulnerabilities live. A remote named "AddCash" that takes an amount is an open door. Instead:

• The client asks; the server decides. The client says "I want to sell my backpack". The server checks what's in the backpack and works out the price.
• Never send prices, damage or rewards from the client. Look them up on the server from your own data.
• Check argument types. If you expect a number, confirm it's a number, it's finite and it's in range. Exploiters send strings, huge numbers, negative numbers and NaN.
• Check ownership. If the client says "equip pet 42", confirm that player owns pet 42.
• Check state. Can the player do this right now? Are they alive, in the right area, not on cooldown?
• Return as little as possible from RemoteFunctions, and never call a RemoteFunction on the client from the server and wait for an answer, because an exploiter can simply never answer.

Rate-limit actions on the server

Even valid actions become exploits when spammed. Keep a per-player timestamp of the last time each action was accepted and ignore requests that come faster than a human could plausibly send them with their current tool or cooldown. Do the same for chat-like features, trades and purchases.

Sanity-check movement

Because players control their own characters, speed hacks and teleports are common. You can catch the worst of them on the server:

• Check distance over time. If a character moved further than their walk speed allows since the last check, with a generous allowance for lag, move them back.
• Check distance for interactions. If a player tries to collect a coin 300 studs away, refuse it.
• Be forgiving. Laggy players on mobile can look like teleporters. Rubber-banding a player back is better than banning them, and log it for review.

Protect your economy

• Keep currency server-side only. Store it in a server table or attribute set by the server, never in a value the client sets.
• Validate trades on both sides and confirm both players still own the items at the moment the trade completes.
• Log big changes. If a player's cash jumps by a huge amount in a minute, record it. Logs let you find exploits you didn't know about.
• Save carefully. Duplication exploits often abuse rapid server hops. Session locking stops them; see how to save player data.

Don't rely on client-side anti-cheat

Scripts that run on the client to detect exploits can be deleted or disabled by the exploiter. They can catch lazy exploiters and are fine as an extra layer, but anything that matters must be checked on the server.

Banning

Roblox's Ban API (Players:BanAsync) lets you ban users from your experience for a set time or permanently, with a reason shown to them and an option to also catch suspected alt accounts. Use it for clear, repeated abuse, keep a record of why each ban happened, and give players a way to appeal (a form or a Discord channel). Banning someone for a false positive costs you a player and often a bad review.

Test like an exploiter

Before launch, ask "what happens if a client fires this remote with silly arguments a thousand times a second?" for every remote you have. Try it yourself in Studio with a test LocalScript. Any remote where the answer is "something bad" needs another server check.

Checklist

• Every RemoteEvent and RemoteFunction listed and reviewed
• Server decides prices, rewards and damage; client only asks
• Types, ranges, ownership and state checked on the server
• Per-player rate limits on actions, trades and purchases
• Movement and interaction distance sanity checks, lag-tolerant
• Currency and trades server-side, logged, saves session-locked
• Client checks treated as an extra layer only
• Ban API used with records and an appeal route

Exploiters often target games just as they start growing. BloxIQ's game feed flags unusual movements in tracked games, and the research tools help you see which genres attract big, fast-moving audiences, where economy exploits do the most damage.