ColMathe app for iPhone and iPad

Please complete the calculation formula of addition.
Please add a 3-digit numeric value of 4 and use some hint as a hint to make it the correct expression.

In the color of the calculation formula, same numerical value is entered for the same color.
Because the hint number decreases with level, the difficulty level gets higher.

Remarks
· The numerical value will be in the range of 100 to 999.
· Because it is the addition of 4 digits of 3 digits, the total value will be in the range from 400 to 3996.
· The four numbers are arranged so as to become smaller from the upper row to the lower row.
· The current correct answer status is displayed on the right side of the total number.
· Even if it is not an example answer (assumed value), it will be cleared if the total value matches.
· When you press the "Leave" button, the value of the model answer is displayed.