HOWTO:Multibox a flash game

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This Realm of the Mad God multiboxing walkthrough for ISBoxer 41 video demonstrates how to begin multiboxing Realm of the Mad God!

This guide will help you set up Flash games, like Realm of the Mad God, for multiboxing with ISBoxer!

One thing to note before we get started. This isn't the way you usually play your Flash games. You usually do it through a browser, which makes "updating" the game transparent (something you don't normally think about). When your game has an update, you will probably need to follow this process again in order to apply it to your game launcher.

A quick note about compatibility

To work with Flash games, ISBoxer requires Flash to be hardware accelerated.

Adobe indicates that this currently requires graphics drivers from 2009 or later and a graphics chip supporting Pixel Shaders version 2.x or later. [1]

We have a very simple test that can determine if Flash hardware acceleration is supported on your computer, so that you know if ISBoxer will work for you with Realm of the Mad God. It's at the bottom of this page:

Part 1: Get Adobe Flash Projector

Adobe Flash Projector will be used as our Flash game launcher. It's free, and it's pretty easy to use.

As of this guide, the right download is labelled "Download the Flash Player Projector".

As of Jul 1 2019, it has been confirmed that Flash Projector (or flashplayer) 32 works.
Version 32 can be found at at this link

Other versions can be found at

Part 2: Get the Flash game's URL

Known games

We can automatically retrieve the URL for you, for known games. If your game is not listed see Other games, below.

Other games

This part is usually done in your web browser.

To get the URL for your Flash game, first go to the web page the game is played on, such as for this example.

You will need to "View Source" to find the .SWF file name. You can usually do this by pressing Ctrl+U in your browser.

In the HTML you're looking at now, you need to find something that looks like this -- or search for .swf.

<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"
			id="AGCLoader1331599726" width="640" height="640"
			<param name="movie" value="AGCLoader1331599726.swf" />
			<param name="quality" value="high" />
			<param name="bgcolor" value="#000000" />
			<param name="wmode" value="direct" />
			<param name="allowScriptAccess" value="sameDomain" />

Note the part that says <param name="movie" value="AGCLoader1331599726.swf" />. This has our .SWF filename in it! This can be a full URL, or a relative path. In this case, it is a relative path so we copy and paste the filename (AGCwhatever.swf) onto the URL of the page it's on: This URL is probably not the current ROTMG url, you need to follow the steps yourself!

You can try out the URL in your browser to make sure it works!

You will need this URL in part 3.

Part 3: Add your game launcher to Inner Space

Now that you've downloaded the Adobe Flash Projector and have the URL, the only thing left to do is to add it to Inner Space and get playing.

  1. Right click the Inner Space icon in the system notification area
  2. Select Add Game
  3. Enter a Name for the game, e.g. "Realm of the Mad God"
  4. Click the "..." button to your Adobe Flash Player download from Part 1 (e.g. flashplayer_sa_21.exe)
  5. Paste the .SWF URL from part 2 into the "Parameters" box
  6. Click OK

Part 4: Multibox!

Make sure this box is checked, or ISBoxer will not work with Flash

That's how to get it added to Inner Space, and now you're all set to use ISBoxer! Make sure to use the Quick Setup Wizard, and follow Quick Start Guide 41!

You will also need to make sure that "Enable hardware acceleration" is enabled in your Flash settings before launching your team.


If you launch the game through Inner Space and do not see the FPS/Memory indicators as shown in the video, your team will not fully launch as shown in the video either. To resolve this issue you may need an updated build of Inner Space, available as the "development build". To try it, right click Inner Space and select Patcher, check "Download development (test) patches", then close and restart Inner Space to let it patch up. Repeat and see if it works. :)

See Also