Absolute Brain Puzzle

A simple rule subtraction puzzle. If you overlap two numbers, it will change to the difference.
Bold at the beginning and cautious at the end. .. .. Please enjoy the pleasure of erasing all the numbers.

You can enjoy three modes : (At first, only (1) can be played)
(1) Time Attack Light: Enjoy easy puzzles, with a time limit
(2) Time Attack Classic: Challenge to conquer 50 levels, with time limit
(3) Steady: Calmly work on about 500 puzzles, no time limit

Aim to reach level 50!

[Recommended for]
- Who want to train their brains while competing with family and friends
- Who want to do brain teaser for free
- Who want to improve their concentration and calculation speed
- Who are interested in games that can improve IQ, become smarter, use the head, and exercise the head
- Who are interested in dementia prevention
- Who want to take measures for the Kraepelin test
- Who want to play puzzles that can be played offline (outside the service area) without internet connection
- Who want to prevent dementia with a game that can be played with easy subtraction
- Who like number puzzles such as Sudoku and Number Place, and puzzles such as solitaire, minesweeper, and slide puzzles that you can work on by yourself.