Designing Games with Game Maker - YoYo Games

can check whether a mouse button is pressed and, if so, for example move to that position
(use the jump to a point action with values mouse_x and mouse_y).
Check Grid
Returns true if the position of the instance lies on a grid. You specify the horizontal and
vertical spacing of the grid. This is very useful when certain actions, like making a turn, are
only a llowed when the instance is on a grid position.
Start Block
Indicates the start of a block of actions.
End Block
Indicates the end of a block of actions.
Else
Behind this action the else part follows, that is executed when the result of the question is
false.
Repeat
This action is used to repeat the next action (or block of actions) a number of times. You
simply indicate the number.
Exit Event
When this action is encountered no further actions in this event are executed. This is typically
used after a question. For example, when a position is free nothing needs to be done so we
exit the event. In this example, the following actions are only executed when there is a
collision.
If you want more control over what is happening in the game you can use the built-in
programming language that is described on part 4 of the documentation. If gives you much
more flexibility than using the action. Simpler use but also important involves the use of your
own variables. The following actions deal with this.
Execute Code
When you add this action, a form shows in which you can type in a piece of code which must
be execute. This can contain simple function calls or more complex code. Use the code action