I'm not sure exactly how far you've got, iRob, without knowing what candidates you have for the empty cells.

This puzzle has lots of examples of locked candidates = if a candidate has to be in one row or column in one box then you can eliminate it from all other cells in that row or column in the other boxes.

The candidate 3 must be in row 2 in box 1 => remove all other 3s in row 2. Also locked - the 4s in column 6 in box 2 and the 5s in row 6 in box 4.

Once you’ve got this far you’ll find a pair 8,4 hidden in box 6 => remove all other 8s and 4s from box 6 and column 8. If these terms are unfamiliar check out this site

Simple SudokuThere are more locked candidates and pairs which once you find them will crack the hardest part of the puzzle - from there it will fall apart. See how you go, but come back if you’re still stuck.