Ok. In gamestudio, you only can create "empty" objects via script (ent_create(NULL,...)).
Quote:
What would be the best way to make the cube invisible?

Place the object in your level, attach your spawn action and write
set(my,PASSABLE | INVISIBLE);
in your script.
Alternatively, you can set the flags in WED, remove the action and choose a name for that entity. Then you can access the object with "ent_for_name".

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