Answer to Riddle 3 should be FOOTPRINTS rather than FINGERPRINTS.
20 Riddles That Will Challenge Your Brainpower
Solving riddles can force you to think in creative or unusual ways that will make your brain cells work overtime. This can stop the brain from shrinking with age, boost memory skills, and improve brain-cell connections.
We at Bright Side want you to have fun while exercising your brain and that’s why we prepared a compilation of entertaining, mind-boggling riddles.
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Which one was the hardest for you to guess? Share these riddles with your friends to help them keep their minds sharp.
Comments
The last one is not correct. If the 7-8 pages are on one paper than the 100-101 and 222-223 can't be so the answer is 5. If the 7-8 pages are on two different papers than the 100-101 and 222-223 are on one paper so the answer is 4.
Riddle #19 (How many attempts) - Can be done with only 3 attempts. Two attempts for the first door (the third would obviously be the correct one), one attempt for the second.

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