Sudoku Solver
Published:
Created a Sudoku solver that can take any puzzle and solve it as long as there is at least one tile where only one number is possible.
Later upgraded with backtracking: the solver guesses a number for a tile, continues, and if it reaches a contradiction it backtracks to that point, eliminates the invalid number, and tries the next one.
Coded entirely in Notepad with no version control — never uploaded to GitHub.