Getting in
Three steps, and no installer
No need to install anything, one launcher is all it takes.
Client
An unpacked Xero client
The folder with xerogame.exe in it. If you already play, you have this.
Launcher
Our launcher beside it
Download it above and drop it into that same folder. That is the whole install.
Run
Start it and log in
Your account will get automatically created. Hit play and you are in.
How it works
Built to be the only thing you download
One file, nothing unpacked
The interface, the patcher and the client modules are all baked into the executable. Nothing has to sit next to it and nothing is left behind in the folder.
Auto Update
There is no need to check for updates, we manage this automatically for you.
It points the client at us
The client's connections are redirected to our server, so there is zero risk of getting banned. No one other than us is able to log anything here.
Your login, remembered properly
Tick Save and it keeps your ID and stores the password encrypted, on your machine. Leave it unticked and it keeps nothing at all.
For players
Every item is free. Go and try them on.
The shop costs nothing here. Take whatever you like out of it, put it on, and go and look at yourself in an actual match - how the set moves, how the colours read at speed, whether it works with the rest of your set.
That's a thing you can normally only find out after paying for it. Here you find out first, and you can change your mind as often as you want.
- Nothing to pay, nothing to grind. The whole catalogue is open from the moment you log in.
- See it in game, not on a page. A thumbnail on a shop page tells you very little about how something actually looks ingame.
- Change it as often as you like. Everything is free, so there is no wrong choice to regret.
For developers
An open playground, and nothing to get banned from
Sandbox is meant literally. This is our own emulator on our own stack, with no official service anywhere on the other end. You keep full privacy, there is nothing that gets send to official servers.
If you came to take S4 League apart rather than to play it, that is a use we built for, not one we chase people over. Capture the traffic, hook the client, read the protocol, break it and tell us how.
- A clean state. An untouched Xero client and an emulator precisely replicating original server behavior, so what you measure is the game and not somebody's patch on top of it.
- Reverse engineering is the point. Packet captures, memory edits and hooks are explicitly allowed here.
- Bring your own tooling. Proxies, debuggers, dumpers - none of it is something we work against.
Before you ask
The usual questions
I already have the launcher. Do I need this download?
No. It updates itself on every start. This page is only for a first install.
Why does it want administrator rights?
To redirect the client's connections to our server.
Where do I put it?
In the client folder (the one containing xerogame.exe). It has to be beside the client, not in a folder of its own, because that is where it starts the game from.
My antivirus is unhappy about it.
It launches and patches another program at runtime, which is behaviour scanners flag on sight and without a signing certificate there is nothing to vouch for it. Add an exception for it, or grab it again from this page if you want a clean copy.
Nothing happens when I start it.
Almost always the launcher is not in the client folder, or an antivirus removed part of it after the download. Check both, then run it again.