|id||Index of the mp_grid that is to be destroyed|
You can use this function to destroy the indicated mp_grid and
free up the memory allocated it. It is essential that you
call this whenever the mp_grid is finished with or you could
potentially get a memory leak, meaning that your game will slow
down over time and eventually crash.
NOTE: Using mp_grid_* functions on a grid after it has been destroyed will result in an error!
if timer = 0
The above code will destroy the mp_grid indexed in the variable "grid" if the variable "timer" is equal to 0, and then goto another room.