Maniascript is a powerful scripting language for ManiaPlanet games, you can write new games modes, plugins for the map editor, or make you manialinks more interactive.
If you have programmed before, the basic keywords and language syntax should be quite easy to master.
Filename extension for scripts is ".script.txt"
The way to create or change a script depends on the type of script you want.
To learn more about those different contexts, see here...
When trying to found bugs in a script, you'll use the Debugger. For now, you can only access it by pressing Ctrl+~. It works pretty much anywhere in game. It has 2 modes : a reduced mode where you can only see the logs without interacting, and the Full mode. In Full mode you can select the script that you want to debug (because many scripts can be running at once, for example a camera effect, and the rules of your game). It will show you only the log of the selected script, along with the code of the script, which you can not edit there.