I teach C++ and I made my students code a Sudoku solver last year. It's a very convenient project to give them: self-contained, already familiar, no OS-specific

I teach C++ and I made my students code a Sudoku solver last year. It's a very convenient project to give them: self-contained, already familiar, no OS-specific weirdness, you get to use STL data structures, algorithms, very gentle I/Os...