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Navigation
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Open the Level Editor window using the Tools → Level Editor menu.
Press the + button to add a new level:

Click on the items in the spawn list to spawn objects on the scene and place them where you need. You can choose an item’s type on its inspector (Normal - ordinary white item which should be absorbed on level, Obstacle - wrong items, absorbing of which leads to a game over) After changing the item type it will change to the appropriate color automatically.



Changes you’re making are saved automatically.
There are other useful buttons: