What you mean by "some outlines"? I kind of don't understand what you're talking about.
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Okay, got you here. I was thinking about it and that sometimes it may be hard to understand which object is collidable. Yet I thought on the other hand that it may look unnatural in child's notebook to have some kind of outlines. Guess the solutions was to make some kind of identification that object can be used in game, but made it on paper. Will think about it, thanks!