Built In Global Variables

GameMaker Studio 2 has a collection of "built in" global variables and the majority of them are very specific and will only be used on rare occasions - these are listed in the appropriate sections of the manual - but there is one important one that is used frequently and isn't listed elsewhere:

There are also three deprecated built in global variables which you should be aware of (these variables are only designed to support legacy projects from previous versions of GameMaker and should not be used in new projects):