Jawohl!!! Yes!!! Katta!!!
I did not have a clue how to make a sudoku solver.
To stop my despair I started with the first test. The string tests did not take too long time to write and complete.
I got a little bit of confidence.
Placement tests took a little bit longer time but my confidence swelled and I started to get an idea of how to use the tests for solving a sudoku.
By now this challenge was more fun than scary and I read about sudoku solving strategies on Wikipedia .
Since I am more practical than theoretical I went for brute force strategy with the fancy name backtracking.
A week working full time my sudoku-solver spat out a correct solution!!!
I got tears in my eyes.
I have no idea if it is enough to pass the challenge but I could not resist to write this.