Color Sudoku

The objective is to fill a 9x9 grid with colors so that each column, each row, and each of the nine 3x3 subgrids that compose the grid contains all of the colors.
You have one sudoku to solve.Once you complete sudoku, click "Download" button appearing to get new sudoku from database.
10 sudoku, each having high level of difficulty, will approximately be uploaded to database every week.
When you encounter with an error related to sudoku, click "Reload" button to get the same sudoku from database.