0. Select the difficulty level and start the game.
1. Addition or subtraction is given.
2. Calculate the problem within the specified time and choose from two options.
3. Just answer 1~2 correctly in a row without making any mistakes.
If you clear three difficulty levels, a new difficulty level will appear...?
1. Addition or subtraction is given.
2. Calculate the problem within the specified time and choose from two options.
3. Just answer 1~2 correctly in a row without making any mistakes.
If you clear three difficulty levels, a new difficulty level will appear...?
Open up