or solve online (using our beta test of Penpa-Edit tools; use the tab key to alternate between a Star Battle placement option and a Sudoku number entry option)
Theme: Christmas Tree
Author/Opus: This is the 331st puzzle from Thomas Snyder, aka Dr. Sudoku.
Rules: Classic Sudoku rules, with the digits 1-7 and two stars to be placed in each row, column, and bold region. As in Star Battle puzzles, the stars cannot be placed in adjacent cells that share an edge or corner.
Answer String: Enter the 5th row from left to right, followed by a comma, followed by the 9th row from left to right. Enter a capital letter X for any cell with a star in it.
Time Standards (highlight to view): Grandmaster = 2:30, Master = 4:30, Expert = 9:00