Color Sudoku will show you patterns and logics not easily found on regular numbered games. Give it a try and you will see.
Contiuous range of difficulty provides more control over your desired playing level. All nine colors are selectable (if you don't like any of the original ones).
Color placements and color anotations are easy to pick through a multicolor fan that appears around the clicked cell. Play a full game without a hand on your keyboard, just with your mouse.