Smooth and Shadows question

Created a 1m cube for test purposes in Blender. Used the "smooth" button (instead of flat) in object mode.

Now get some weird shadows, what did I miss?

VO34dRi.jpg
In front my cube, behind the one from the ingame art shapes.
If you look at the shadow on the gras, I would expect it to look similar like the cube behind.

Any help and explanation would be amazing!
 
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