Take your time and do not rush. Ksudoku is not a 'quick' game to play.

Pay attention to the row, column, and section colorings. They are here to aid you in the game.

Make sure that so duplicate symbol exists already in the row/column/section you are entering it to.

If in doubt, try to foresee if a square you are entering a symbol into maybe needed by some other symbol, which otherwise cannot go anywhere else due to the row/column/section rule violation.

If you are having troubles, try to retrace your steps and see exactly where you have made an error.

Even though Ksudoku provides a 'Hint' option for you, try not to use it often. Remember solving the puzzle all by yourself enhances your brain activity, while using the 'Hint' feature too often is cheating.

If you have much trouble solving a certain puzzle, and simply must use the 'Hint' feature, then maybe you should try to decrease the difficulty level, or try a simpler, more basic puzzle.

Some puzzle layouts feature very specific game board shapes. It is a good idea to have the coloring option enabled even if you consider yourself an experienced player.