Roman Numeral Sudoku (Mini Sudoku Series #44)

This Roman Numeral Sudoku recently appeared in the WPF Sudoku Grand Prix 2015 Round 4. I made this mini version for our Mini Sudoku Series. The puzzle uses a 6x6 grid. But instead of normal number clues, it uses Roman numerals. The clues are for the numbers 1 to 6. They are written as I, II, III, IV, V, and VI.

The clues are not always complete Roman numerals. Some of them may be just part of a Roman numeral. You have to figure out which digit goes in each cell. This makes the puzzle a fun and different challenge. This puzzle is a great way to practice a unique clue system.

Rules of the Roman Numeral Sudoku

Mini Classic Sudoku Rules apply. Additionally, instead of clues for the digits 1 to 6, this Sudoku gives clues for Roman numerals I, II, III, IV, V, VI. Not all clues are complete numbers; some of them may be just part of the Roman numeral.