USB Sudoku Portable

USB Sudoku Portable is a very small implementation of the original game Sudoku. It includes multiple difficulty levels and a built-in solver to ensure all puzzles have exactly 1 solution. This version features: Five difficulty levels as well as customizable difficulty, Entry of possible solutions for empty boxes (hold down shift and a number from the standard number row, not the numeric keypad), Automatic saving of your game on exit, "Check Game" feature to check your current work, "Solve Game" feature so you can see the solution to the current puzzle, Resizable interface, so you can make the numbers as large as you'd like.