Notes on this puzzle
Sudoku #5410 is an expert grid with 29 givens, which leaves 52 cells waiting for a digit. Played purely by logic, it takes 54 forced steps from the first placement to the last.
Most cells fall to the hidden single move: 49 of the 54 steps. Single candidate accounts for 3 more. The toughest moment needs XY-Wing, and that single step is what sets the level.
Among the givens, 3 is the most common digit (5 times) and 2 the rarest (2). The emptiest box is the central one, with 1 given; the top-left box is the most crowded, with 5.
Where to beginLook at row 1, column 3 first: a hidden single is available there from the very start. Expect a stage where only a pattern across several lines moves the grid on; full notes make it visible.