Welcome back, SuperRhys217! Unfortunately, SMBO is no longer being hosted nor updated. However, if you want to keep in touch, feel free to join our Discord channel.

Since that site is no longer up, I looked for it on archive.org and found a snapshot here: http://web.archive.org/web/20160106005505/https://code.google.com/p/eclipse-mmorpgmaker/downloads/list

These downloads work and should help you out.

Hi resolutionssb,

Unfortunately I don't have the file, but please try out the Windows Vista & 7 (also for Windows 10) fix here: http://www.supermariobrosonline.tk/uploads/Windows_Vista_&_7_Fix.rar

When launching SMBO, make sure to run it as an administrator.

Hi resolutionssb, welcome to the forums! I'm glad you want to give SMBO a go; unfortunately these forums are quite dead, but there is indeed a Discord!

You can find the invite link here: https://discordapp.com/invite/jud3Bsb

We look forward to seeing you there!

Sorry for the delay. The server should be back up now!

Hello greendog123, the servers are currently down but we'll try to get them up as soon as possible. Thanks for your patience!

The server is back up. Thanks for your patience!

Hello toadstool345, we're very sorry for the late reply. We've been working to get the server up and should hopefully have it up shortly. Sorry for the inconvenience.

Hey purplystuff; the server is currently down, but we'll work to get it back up soon. Sorry for the inconvenience.

Hello MajorMinor, we chose to compress the download in RAR because it provides a smaller file size than ZIP. WinRAR itself is not required, but you will need a program that can decompress the RAR file. 7-Zip is a popular choice that is completely free, so give that a try and let us know if you have any issues.

Hello Burning Achaes, welcome to SMBO! Sorry for the late reply.

The server shows that it's up right now. If you have trouble connecting try updating your client and let us know if the issue still persists.

Hello emmanoelbs, how've you been? The server is currently offline, but we will work to get it up as soon as possible.

I recommend you join our Discord, as we mostly keep in touch there: https://discord.gg/mZKAAnn
There is a group of players that recently made new accounts and played together, but if you ask on our Discord I'm sure they will make some time for another SMBO gathering.

It's nice to see your renewed interest in SMBO, and we hope to see you on the Discord!

[Discord (this is where most of our discussions will take place):]

We have begun an SMBO Revival Project. Most of this is a repost from the other topic.

Discord (this is where most of our discussions will take place):
https://discord.gg/jud3Bsb

Repository:
https://github.com/tdeeb/SuperMarioBrosOnlineRevival

Google Doc:
https://docs.google.com/document/d/1tyGA_aW-nBEJDy7ZwRpncU4XDI4A9s6xDVacchs9-Eo/edit?usp=sharing

All set up instructions and other information is on the Google Doc.

Currently all the project has is a placeholder image with a script that allows for unbounded movement. I created an AudioManager for playing music and sounds but didn't test it thoroughly. Right now I'd like us to focus on client-side functionality, then hook in a server using Unity's networking, as I've heard it has greatly improved.

Anyone is welcome to contribute. If you have any questions feel free to ask.

[Right after you open the project in Unity for the first time, immediately go to Edit > Editor > Asset Serialization and set the Mode to "Force Text" if it isn't set already. Git handles Unity assets forced as text much better and will give you fewer problems with this setting.]

Sorry for the double post, but I felt motivated to set up the project myself and created a repository for it here:
https://github.com/tdeeb/SuperMarioBrosOnlineRevival

Clone the repository, download the newest version of Unity (5.5) and ask me to add you as a collaborator if you don't have sufficient privileges to push and pull from the repository (set up a GitHub account if you don't have one). When installing Unity, only select to install the Unity editor and VS Tools for Unity, as the other things are unnecessary for us.

Right after you open the project in Unity for the first time, immediately go to Edit > Editor > Asset Serialization and set the Mode to "Force Text" if it isn't set already. Git handles Unity assets forced as text much better and will give you fewer problems with this setting.

You're free to use whichever editor you prefer, but I have the .gitignore file set up for Visual Studio 2015, and Unity integrates with it extremely well. You may have to adjust the .gitignore file if you're using a different editor and don't want to track the editor files it creates. Furthermore, if you do not use Windows as your OS, you can still help with this project as Unity (and Git) is cross-platform.

If you're not familiar with Git, I suggest you read up on it here:
https://help.github.com/articles/good-resources-for-learning-git-and-github/

The command line allows for more functionality but I prefer using a Git client, such as Git Extensions. Other clients people use are SourceTree and the GitHub Client, but I'm strongly opposed to the latter as it is not as well-developed as the others and doesn't provide as many features (to put it into perspective, I worked with a non-technical artist who had trouble with it despite how minimal its UI is).

Currently all the project has is a placeholder image with a script that allows for unbounded movement. I created an AudioManager for playing music and sounds but didn't test it thoroughly. Right now I'd like us to focus on client-side functionality, then hook in a server using Unity's networking, as I've heard it has greatly improved. However, feel free to work on whatever you want.

If you have any questions feel free to ask.

Update: We now have a dedicated SMBO Revival channel on our Discord server. I recommend anyone interested in participating to join it, as that will likely be where most of our discussions will be had. You can join it here:
https://discord.gg/jud3Bsb

The revival project has unfortunately fell through a while ago, but if you wish to start it up again that would be great, and I'm sure others would be interested in helping as well! I'm mostly busy nowadays, but I might be able to help every now and then if this got going.

I would still recommend using Unity or another solid commercial engine, as it would reduce the workload immensely.