Found indoors or underground

This one is just a matter of knowing where to look

It is possible to find this one after solving the very first puzzle in the game

You have most definitely already been in the location of this puzzle

Return to the very beginning of the game. Look through the doorway into the tunnel where the game started. The top of the door frame has a partial circle on it. Line it up with the hole at the end of the tunnel by backing up onto a small hill inside this little cave.

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The two elements involved in this puzzle are a doorway and a tunnel

You might find this one satisfying to discover on your own

Eye-level (no need to look up or down)