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so, when i do something simple like

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int field[8][8]

in the global code area and give it a name like "startup", is THIS 2d int array then really global
and accessable by every actor in my game ??

yes, but don't forget to end the line with a semi colon and save the global code

But note that it will be global only if it's not in any function code.
Declarations must be the first things in Global Code.

Like this:

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int myVar[10][10]; //This will be global

void move(int amount)
{
    x += amount;
}

Not this:

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void move(int amount)
{
    int myVar[10][10]; //This will not be global, it will be the functions own variable
    x += amount;
}

thanks!