Upon me you can tread, though softly under cover.
And I will take you places, that you have yet to discover.
I'm high, and I'm low, though flat in the middle.
And though a joy to the children, adults think of me little.
Answer: Stairs.
This riddle appears in the following downloadable PDF files:
Can you solve one of the most famous logic puzzle ever?
Memory Matching game for kids, adults and seniors.
Connect the matching tiles and pop them all.