The program features a true Sudoku Generator, unlike many which simply rotate and flip a generic set of puzzles. Sudoku is a number placement game which requires great patience and a good logical thinking ability! The aim of the game is to place a numerical digit 1-9 in each cell of the 9x9 grid so that each row column and 3x3 block contain only one instance of each number. The program features a true Sudoku Generator, unlike many which simply rotate and flip a generic set of puzzles. Puzzles are generated to match your skill level. We have also added a comprehensive hint system which helps you learn some of the more difficult moves. The pen and eraser mode allows you to draw directly onto the play area . This is useful for making notes or working out your next moves. 5 Levels of Difficulty Comprehensive Hint System Brute Force & Logic Solvers Pen and Eraser Scribble Mode Editable Candidate Lists X-Wings variations & Swordfish etc. Coloring & Forcing Chains Clock Start, Stop and Reset Load and Save Your Progress Snapshot and Restore facility Import and Export SDK text files