So usually I can rely on being able to eventually find the logical path for Bram's puzzles, but this one (second to last Sudoku!) has me stumped. I forced myself through now, should try again some time on paper...
I got stuck after entering in about a dozen numbers, but then I found a hidden pair in column 2 (row 2 and 9) that forced row 9 column 1. That unlocked the rest of the puzzle for me.