1.35 (public)	Bug fixes
1.31 (public)	Automatic bug reporting, improved error handling and checking for updates Added registration Added many options
1.11 (internal)	Added several killer sudoku techniques including multiple rows/columns Added tool windows for highlights and cage hints
0.7 (public beta)	Killer sudoku including monster killer and jigsaw killer Great new look with transparent buttons and great looking backgrounds
0.6 (first public version)	Automatic pencilmarks High quality puzzles No guessing or trial and error Fast generator (often less than a second) Five difficulty settings Load and save .sdk files Copy and paste Quick save if you want to take a break Blank puzzle mode Auto solve mode to check puzzles Help function, start up tips, tooltips Options screen