[Brain Activation for Seniors] How about enjoying a fun mental workout with a fish kanji quiz?
I’ve put together a collection of slightly challenging riddles for college students.
Even students who study regularly might find them a bit tricky.
Whether you try them alone or have fun with friends at school, I think they’ll be a hit.
Hope you enjoy them!
- [Easy] Fun and Educational Quizzes! A Collection of Interesting Problems for University Students
- Riddles for college students. Questions that test thinking and creativity.
- A collection of challenging quizzes for adults [Difficult]
- [Difficult] Riddles for High School Students
- A quiz site for university students, featuring everything from academic to entertainment quizzes!
- [Trick Quiz] Quiz Questions That Excite Everyone from Kids to Adults
- [Brain Training] Difficult Riddles That Even Adults Struggle With
- [Easy] Riddles for High School Students
- Funny quizzes and riddles that get everyone excited in high school
- Recommended for kids! A collection of challenging riddles. Difficult questions that make you think.
- [Hard] Riddles for junior high school students
- Fun Quiz Questions That Will Liven Up the Office [2026]
- [Satisfying When Solved] Challenging Quizzes Recommended for Elementary School Students!
[Elderly Brain Activation] Want to enjoy a fun mental workout with a Fish Kanji Quiz? (11–20)
A riddle that lets you show off once you solve it

“Doyagao” may sound a bit suggestive, but if you actually find yourself in such a situation, you can’t help making a proud face, right? After all, it’s the moment you feel proud of yourself, so it’s bound to feel good.
With that in mind, here are some riddles that will naturally make you pull a ‘doyagao’ when you solve them.
Try them out with your friends!
Riddles for Grown-ups

Let me introduce some riddles for adults that make you dig your own grave precisely because of the knowledge you’ve picked up after becoming an adult.
The key to solving them is to just try straightforwardly, as simply as possible! If you got tripped up, you might be quite the…
Brain-training riddle quiz

Here’s an introduction to some riddles that can help train your brain.
Once you hear the answers, you’ll probably think, “Oh, of course!”—but they’re trickier than they seem.
I’m sure university students like you have flexible thinking.
Aim for a perfect score and give them a try!
A vehicle that keeps flying even when it’s cut in half

Regarding the riddle in the title, did everyone figure it out? Even after hearing the answer, it didn’t click for me—it was a vehicle I’m not very familiar with.
This is a compilation video of 18 riddles, so how about watching it when your mind is too alert to sleep?
If you put a dot on a certain part of a house, does it become delicious food?

If you put a dot on a certain part of a house, it turns into a delicious food.
Which part is it? People in architecture might get especially tangled up.
The key to this riddle is: what does it mean to “put a dot”? Once you know the answer, you’ll probably feel frustrated.


