What does a WW1 Trench, A Submarine and a Popular Phone App all have in common?

What does a WW1 Trench, A Submarine and a Popular Phone App all have in common?

Other Difficult Riddles

This is needed both for courage and hardcover books.

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By the way, what never moves, wears shoes, sandals and boots, but has no feet?

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I went to the woods and got it, when i got it didn’t want it, looked for it, couldn’t find it so I took it home.

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My sides are firmly laced about, Yet nothing is within; You'll think my head is strange indeed, Being nothing else but skin.

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Kills the bad ones and the sad ones. Tightens to fit, so one size fits.

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Riddle of the Day

Jun 17, 2026

I’m grown from darkness but shine with a pale light. Very round I am and always a lady's delight.

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