100 Doors Puzzle || Hard Puzzle for Genius minds

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There are 100 doors in a row. They all are initially closed.
A person walks through all the doors 100 times and every time he toggles the state of speific doors. that means he changes
the state of the door,. if the door is closed, he will open it.. and if its opened then he will close it.
In each walk he selects specific doors to toggle, in the following manner.

In his first walk, he toggles all the doors in multiple of 1.. that means he toggles all the 100 doors.
In the second walk, he toggles the doors in multiple of 2.
In the third walk, he toggles the doors in multiple of 3. that means, he will change the state of door no.3, 6, 9, 12... and
so on.
In the fourth walk he toggles doors in multiple of 4.

This way he walks for 100 times.

The puzzle is : What door numbers will remain opened after 100 walks.
(Remeber that initially all doors are in closed state)

This video explains this puzzle the best way. You will certainly learn the optimal way and the best approach of solving difficult puzzles.

Also try these mind blowing puzzles:
Which Tank Will Fill Up First? || Solution || VIRAL PUZZLE

Can you solve the Tricky Puzzle || The Clever Commuter || Logical Puzzle

You can follow my facebook page of Logically Yours( Mohammed Ammar ):
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Very difficult puzzle, but your explanation is very detailed. Thanks a lot for making this video....

lokeshreddy
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I can imagine how difficult making the animation would have been and appreciate how it makes understand the problem and approach to the solution so easy.
But, I loved the door opening progress bar more than anything else - very creative.

kiranvootori
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I love this type of puzzle, because you feel clever if you figure it out, but if you have to see the explanation it seems so simple and you wish you'd thought of it.

jaygreen
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Really amazing explanation.Actually I was asked to solve this using programming.I even solved it in C++ by factor of a no. You are a genius sir. I never thought about square logic.

kanishkkrishna
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After completing the puzzle by writting all the factors till 100.
Me : i am the most clever in the world.
After video explanation..
Me : Oh, just missed that.

bhaveshkhanted
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Though it is a known puzzle with 1000 doors, your explanation is superb.

udayadityabhattacharyya
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This came in my Olympiad yesterday and today this is in my recommendation!!!!
Aliens Confirmed

shauryaagarwal
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Im too lazy, that's why I so love spreadsheets. Quickly drew up an excel, and instantaneously realized it's only square numbers remaining. That's the solution, so I didn't inquire it any further, appreciate your approach and explanation.

TigruArdavi
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Incredible Totally out of the box Great to watch such a solution....keep it up

navdeepsingh
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At first I didn't get the logic of perfect square but at 3:40 I got the logic. Thanks for the puzzle 🙏

lokeshkoliparthi
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Kinda proud of myself on this one. I usually suck at these problems but I was able to work through it on my own, find the patterns, and get the right result. Very fun!

girlnado
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It's really an awesome one. When you explained perfect square thing with this extraordinary animation. I am just wow! Thanks for making our brain smarter

gopinathnatarajan
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This puzzle was difficult, but after seeing this video I am able to analyze it, thanks Ammar

gurshaan
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very nice explanation easily understand the concept behind this puzzle.

apnapython
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It is really very difficult, but excellent puzzle thanks for your effort.👍👍

manish
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Brilliant and Crystal clear explanation!

priyankabagal
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super explanation what a logic 👌👌 really you are great thanks for making this video sir

suprajareddy
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Thanks a lot for your video and explanation☺☺☺

keerthanasharavanan
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Excellent Work!!! And very well explained. Thank You.

nikhilramteke
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Thanks a ton for wonderfully explaining the puzzle

venkaraj