Sudoku

My record

Fill the grid so that every row, every column and every bold 3x3 box contains the numbers 1 to 9 exactly once.
Pick a cell and press a number to enter it. Wrong numbers show in red, and three mistakes end the game.
Correct numbers are locked in place.
Turn on Notes to write small candidate numbers in a cell. When you place a correct number, matching notes in the same row, column and box are cleared automatically.
Hint fills in the answer for the selected cell (or a random empty cell if none is selected).
Every puzzle is generated fresh and checked to have exactly one solution. Easy gives about 40 numbers, Normal about 32 and Hard about 24 to 26.

Numbers 1 to 9 to enter, arrow keys to move, Backspace to erase, N to toggle notes, Ctrl+Z to undo