Fun Brain Teasers for Kids and Adults Alike!
The clever wordplay known as “tonchi,” familiar from the anime Ikkyu-san.
Ikkyu solves problems that look like riddles one after another with quick wit, doesn’t he?
Originally, “tonchi” refers to the ability to use your smarts on the spot to suit the situation.
We’re going to present tonchi quizzes that you solve using that same kind of wit, just like Ikkyu!
The answers are all ones that will make you say, “I see!” without thinking.
They’re easy to enjoy like riddles, so please have fun with them together—from kids to adults!
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Fun Brain Teasers for Everyone—Kids and Adults Alike! (1–10)
What comes out at night and gets fat or thin?
See the answer
Moon
Speaking of things that come out at night, the moon comes to mind. The moon changes shape from day to day, swelling into a full moon or thinning into a crescent. As the moon orbits the Earth, the way sunlight hits it changes daily, altering how it appears to us. That’s why it seems to grow fatter or thinner.
What is a way to freeze water instantly?
See the answer
Add a dot to 'water' (水) to make it 'ice' (氷).
If you think of this quiz in terms of water or ice themselves, the answer won’t come easily. Instead of treating water and ice as objects, convert them into letters—specifically kanji—to find the solution. Once you can convert “water” into its kanji, the answer should come to you right away!
What is something you cannot sever no matter how much you try to cut it?
See the answer
Trump
When we hear the word “cut,” we tend to think of things that cut objects, like scissors or knives, but the key is to jump to a different meaning of “cut.” When shuffling playing cards, in Japanese we say “to cut” the deck (kiru), but no matter how much you “cut,” the cards aren’t actually severed. So the answer is “playing cards.”
Fun Brain Teasers for Kids and Adults Alike! (11–20)
Who becomes a woman when someone stands on their right, but is a man when alone?
See the answer
husband
If you add the character for “person” (人) to the right of the kanji for “husband” (夫), it becomes “夫人,” which denotes a woman. And on its own, it changes into the word “夫,” which refers to a man, so the answer is “夫.” Quickly visualizing the kanji when you hear the question is the key to finding the answer!
What is a vehicle that won’t move forward no matter how hard you row?
See the answer
swing
Vehicles like bicycles move forward the more you pedal. However, a swing is attached to its frame, so no matter how much you pump your legs, it only moves back and forth and can’t go far. Therefore, the answer to this riddle is “a swing.”
What is small when it’s sunny but becomes big when it rains?
See the answer
umbrella
An umbrella isn’t used when it’s sunny, so it stays folded up and small. But when it rains, it’s opened wide to keep you from getting wet. Instead of getting too hung up on the words “gets bigger” and “gets smaller,” think of it as something not used in sunny weather but used in rainy weather to arrive at the answer!
How can you draw two straight lines in an equilateral triangle to make a regular pentagon?
See the answer
Draw two lines on the kanji for 'three' (三) to make it 'five' (五).
Do not think of this quiz in terms of shapes. As stated in the problem, start by thinking in terms of the kanji for “regular triangle” (正三角形) and “regular pentagon” (正五角形). Then, by drawing one vertical line in the middle of the kanji for ‘three’ (三) in 正三角形, and one line going downward from the right end of the middle horizontal stroke, the kanji ‘five’ (五) appears.


