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what is the diference?

The load function will erase your actual game and load a new game.
The merge don't erase your actual game.

You can use merge to load a pre made actor into different games.

makslane wrote:
You can use merge to load a pre made actor into different games.

and how do i do that?

Often it is best to develop actors separately and then merge them into the main project.

http://www.game-editor.com/forum/viewtopic.php?t=239

If you download tree you can "merge" it into your project.

Make sure you copy the tree data files into your projects data folder.

Now you can create a "tree" wherever you want.

( Tree is a simple example of course... )