1.
Correctly writing jumbled letters
2.
Find the color and shape that matches the conditions
3.
Block Tower Shape Deduction
4.
Find and read Korean
5.
Find consonants and vowels
6.
Compare lengths
7.
Find overlapping letters
8.
Guess the five words
9.
Counting Numbers: Addition
10.
Correctly write inverted letters
11.
Connecting Antonyms
12.
Fill in the blanks with numbers
13.
Complete the picture proverb
14.
Find common letters
15.
Connecting numbers
16.
Find another word
17.
Find the hidden word
18.
Calculate according to the rules
19.
Connect the dots
20.
Find the color that the letters represent
21.
Finding the order of overlapping shapes
22.
Compare weights
23.
Counting Numbers: Subtraction
24.
Find the shadow
25.
Compare sizes
26.
Find the half of the picture
27.
Compare the number
28.
Find the picture pieces
〈Answer〉

You have to use your head to live long.
Take care of your brain health by solving one problem a day!

As numerous brain science studies have shown, the way to maintain brain function and health for as long as possible is to keep your brain active.
In other words, the process of reading out loud, thinking through problems, and picking up a pen to write is the best way to slow down aging.
This book contains 100 problems designed to enhance cognitive skills such as language, math, and thinking.
Don't take it for granted that you will feel physically and mentally unmotivated or that your memory will decline.
Have the will to never neglect brain exercise, the commitment to slowing down aging, and the confidence that you can do it! Start managing your cognitive abilities to maintain a healthy brain until you're 100!