Yo! This is a guide on how to play Split Screen after the ManiaPlanet 4 update. This functionality is still in the game, but Nadeo hid it for some reason??? It works on every title pack.

1) First of all, you need Openplanet. Head to https://openplanet.dev/ and install it;
2) Launch the game;
3) If you see "Press F3 for the Openplanet menu" in the upper left corner, it's all good.

Add this to the launch options if you're playing on Linux:

1) Press F3 for the Openplanet menu;
2) Click "Plugin Manager" then "Open manager";
3) Search for "Classic menu";
4) Click "Install"

1) Now, on the Openplanet menu, click "Scripts" -> "Classic Menu" -> "Local Play"
2) Voilá

This bug is quite rare, but here is the solution:

- Click "Online Play" instead. :)