I can't use all 10 digits here!
Logic
Level
1
\[ \begin{array}{ccccc} & & & \square & \square &\square \\ & & & \square & \square &\square \\ + & & & \square & \square&\square\\ \hline & & 2 & 5 & 5&5 \end{array} \]
The above is a long addition with some numbers hidden in the boxes. Each box represents a distinct digit from 0 to 9.
Fill up all the boxes and find the digit not used.
by
Pi Han Goh