You can open more than two Roblox windows by using separate user accounts or the Roblox launcher settings

Roblox normally limits you to two game windows open at once on the same account. If you want to run three, four, or more games simultaneously — whether you're testing different games, playing with friends in separate servers, or managing multiple characters — you need to work around this limit. The most straightforward method is opening Roblox under different user accounts on your computer, or adjusting your launcher settings to bypass the two-window restriction.

This guide walks you through the actual steps to get multiple Roblox windows running, explains why Roblox has this limit in the first place, and covers what happens if you try to force more windows than your computer can handle.

Key Takeaways

  • The easiest method is to create a second user account on your computer and log into Roblox there, which lets you run two more windows alongside your main account's two windows.
  • You can also edit the Roblox launcher settings file to remove the two-window cap, though this may cause performance problems if your computer doesn't have enough memory.
  • Each open Roblox window uses RAM and processing power, so opening too many at once will slow down your entire computer or cause games to crash.
  • If you're testing games as a developer, Roblox Studio is a better choice than running multiple game windows, because it lets you test without using extra system resources.

Opening Roblox on a second user account

The safest way to run four Roblox windows at once is to use two separate user accounts on your computer. Your main account can run two windows, and a second account can run two more. This keeps each account's limit intact and avoids the performance problems that come with forcing the system to ignore its restrictions.

First, create a new user account on your computer. On Windows, go to Settings, select Accounts, then Add Account. Choose "I don't have this person's sign-in information" and create a local account with a name like "Roblox2". On Mac, go to System Preferences, select Users & Groups, click the lock to unlock it, then click the plus button to add a new user.

Once the second account exists, switch to it by logging out of your main account or using the Windows user switcher (press Windows key + L on Windows, or click the Apple menu and select Log Out on Mac). Install Roblox on this account if it isn't already there, then log in with a different Roblox account. You can now run two more Roblox windows on this account while your main account runs two on its own.

Editing the launcher settings to remove the two-window limit

If you want to run more than two windows on a single account without creating a second user account, you can modify the Roblox launcher configuration file. This method bypasses the built-in restriction, but it puts more strain on your computer's memory and processor.

Close all Roblox windows first. Then navigate to your Roblox folder. On Windows, this is usually at C:\Users\[Your Username]\AppData\Local\Roblox. On Mac, it's at ~/Library/process Support/Roblox. Look for a file called GlobalSettings.xml or ClientSettings.json depending on your version.

Open this file with Notepad (Windows) or TextEdit (Mac). Search for a line that contains "MultipleInstanceLimit" or similar text. Change the value from 2 to however many windows you want — for example, change it to 4 or 5. Save the file, then restart Roblox. You should now be able to open more windows on the same account.

Be aware that this change persists until you undo it or Roblox updates and resets the file. If your computer starts running slowly or games begin crashing, reduce the number back down or restore the original setting.

Understanding why Roblox limits you to two windows

Roblox sets the two-window limit to protect your computer from running out of memory. Each open game window uses RAM, a graphics processor, and CPU cycles. If someone opens ten Roblox windows at once on a computer with only 4 GB of RAM, the system will slow to a crawl or freeze entirely.

The limit also prevents accidental abuse. Without it, a player could accidentally open dozens of windows and crash their own machine, or someone could deliberately do so to interfere with other players' experience on shared computers.

Checking your computer's memory before opening multiple windows

Before you open more than two Roblox windows, check how much RAM your computer has and how much is currently in use. On Windows, right-click the taskbar, select Task Manager, and look at the Memory section under the Performance tab. On Mac, open Activity Monitor (search for it in Spotlight), click the Memory tab, and look at the number next to "Memory Used".

Roblox typically uses between 500 MB and 1.5 GB per window depending on the game. If you have 8 GB of RAM total and 2 GB is already in use by other programs, opening four Roblox windows (which could use up to 6 GB) will leave almost nothing for your operating system and other applications. A good rule is to keep at least 2 GB free after opening all your Roblox windows.

If your computer has less than 8 GB of RAM, stick with two windows or use the second user account method instead of editing the launcher settings. This reduces the risk of crashes.

What to do if games crash when you open multiple windows

If Roblox games start crashing or closing unexpectedly when you have multiple windows open, your computer is running out of memory. Close some of the windows when ready — you don't need to save anything, just close them.

Then check Task Manager or Activity Monitor again to see how much RAM is free. If you're consistently running out of memory, reduce the number of Roblox windows you keep open at once. You can also close other programs you're not using (web browsers, Discord, streaming software) to free up more RAM for Roblox.

If you edited the launcher settings file, consider reverting the change back to 2 or lowering the limit to 3. The two-window default exists because it works reliably on most computers.

Using Roblox Studio instead of multiple game windows

If you're a developer testing multiple games or game versions, Roblox Studio is a better choice than opening multiple game windows. Studio lets you run a test server and play in it without launching the full Roblox client, which uses far less memory.

Open Studio, load your game, and click the Play button. This starts a local test server that you can join without opening a separate Roblox window. You can run multiple Studio instances this way with much less strain on your computer than running multiple full game clients.

Frequently Asked Questions

Will opening more than two Roblox windows get me banned?

No. Roblox does not ban players for opening multiple windows. The two-window limit is a technical restriction to protect your computer, not a rule against the behavior itself. You can modify it without violating Roblox's terms of service.

Can I open Roblox on my phone and computer at the same time?

Yes. The two-window limit applies only to the Roblox client on your computer. You can have two windows open on your PC and simultaneously play Roblox on your phone or tablet without any conflict.

What if I don't have a second user account on my computer?

Creating one takes about five minutes and requires no special permissions. Follow the steps in the second user account section above. If you cannot create a new account (for example, on a school or work computer), your only option is to edit the launcher settings file, but do so carefully and monitor your computer's performance.

Does editing the launcher settings file affect my game performance?

Yes, if you open more windows than your computer can comfortably handle. Each additional window uses more RAM and CPU power. If you notice lag, stuttering, or crashes, close some windows or revert the settings file to its original state.

Can I run Roblox on multiple computers at the same time with one account?

Yes. The two-window limit is per computer, not per account. You can log into your Roblox account on your desktop and your laptop simultaneously, and each computer can run up to two windows (or more if you modify the settings).