Made me do a program that can read a text file full of numbers and solve it as if it was a Sudoku. I wrote the program in C#. You had 4 hours to do it but I was allowed to take it home (possibly because I was a junior).
Interview questions [1]
Question 1
The hardest part of the interview was writing the sudoku app. You had 4 hours to do it but for juniors I think they let you take it home and finish it.