30 Best Riddles to Test Your Brainpower - Can You Solve Them All?

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00:00:00
Two Sand Timers
Start both sand timers at the same time. When the 4-minute timer runs out, flip it over. When the 7-minute timer runs out, flip it over. When the 4-minute timer runs out again (after 8 minutes total), flip the 7-minute timer over. It will take 1 more minute to run out, giving you exactly 9 minutes.
00:00:18
Three Daughters
2, 2, and 9.
00:00:49
The Picture
Is the man’s son.
00:01:06
8 Balls
Divide the 8 balls into three groups-two groups of three balls and one group of two balls. Weigh the two groups of three against each other. If they balance, the heavier ball is in the group of two. If they don’t balance, the heavier ball is in the heavier group. Take the three balls in the heavier group and weigh two of them against each other. The heavier one will tip the scale, or if they balance, the unweighed ball is the heavier one.
00:01:30
10 Bags Of Coins
Take 1 coin from the first bag, 2 coins from the second, 3 coins from the third, and so on until you take 10 coins from the tenth bag. Weigh them all together. If all were real, the total weight would be 550 grams. The difference between the actual weight and 550 grams tells you which bag has the fake coins. For example, if the total is 549 grams, the first bag is fake; if it’s 548 grams, the second bag is fake, and so on.
00:02:05
27 Cubes
Divide the cubes into three groups of nine. Weigh two groups. If they balance, the gold cube is in the third group. If they don’t balance, it’s in the heavier group. Take the heavier group and divide it into three groups of three. Weigh two groups again. Finally, take the heavier group of three and weigh any two. The heavier one is the gold cube.
00:02:19
100 Coins
Take any 10 coins and flip them. These two piles will now have the same number of heads.
00:02:48
100 Lockers
The lockers that remain open are those whose numbers are perfect squares: 1, 4, 9, 16, 25, 36, 49, 64, 81, and 100.
00:03:24
100 Prisoners and Hats
The first prisoner should say the color corresponding to the sum modulo 2 of all the hats they can see. Each subsequent prisoner can then use the previous answers and the hats they see to deduce the color of their own hat.
00:04:02
6 X 6 Grid of Squers
You flip all the squares in one row. The target's color is opposite to what it originally was before the flip.
00:04:27
The Bridge
First, the 1-minute and 2-minute people cross together. The 1-minute person returns with the flashlight. Then, the 10-minute and 5-minute people cross together. The 2-minute person returns with the flashlight. Finally, the 1-minute and 2-minute people cross together again.
00:04:49
Two Ropes
Light the first rope at both ends and the second rope at one end. When the first rope has completely burned, immediately light the other end of the second rope.
00:05:09
Chocolate Bar
Since each break increases the number of pieces by 1, you will need a total of 47 breaks to end up with 48 individual squares.
00:05:42
3 Switches
Turn on the first switch and leave it on for a few minutes, then turn it off. Turn on the second switch and immediately go into the room. The bulb that is on is controlled by the second switch, the bulb that is off but warm is controlled by the first switch, and the bulb that is off and cool is controlled by the third switch.
00:05:58
The Poisoned Wine
Number the bottles from 1 to 1,000 and express each number in binary. Assign each prisoner to one of the binary digits (e.g., prisoner 1 for the first digit, prisoner 2 for the second, and so on). Have each prisoner drink from bottles corresponding to a '1' in their respective binary position. After 24 hours, look at which prisoners have died, which will give you the binary number of the poisoned bottle.
00:06:28
The Farmer and The Boat
00:06:57
Three Hats
Since neither could answer, the third person deduced their hat must be black.
00:07:29
Two Doors
Which door would the other guard say leads to freedom?
00:07:56
Unlabeled Boxes
Pick a fruit from the box labeled 'Apples and Oranges.' Whatever you pick, that box contains only that fruit.
00:08:18
Two Water Jugs
00:08:45
Two Eggs
00:09:18
The Farmer
Three sheep, two goats and one horse
00:09:46
The Mystery Creature
The Fire
00:09:58
The Boat
The answer is because all the people were married.
00:10:13
25 Horses
Total races: 7
00:10:40
The Car Accident
The answer is the surgeon is the boy’s mother.
00:11:07
The Horse
$20
00:11:29
Two Masks
The two men in masks are the catcher and umpire in a baseball game.
00:11:47
Two Villages
Similar "2 doors"
00:12:20
Two Brothers
17 and 7