Nice puzzle, with well telegraphed key element to the solution: very early on, the 3 and 7 pointing from the lower end of column 4 and, means that 1) the 3 and 7 must be in row 1 of block 1, and 2) there is a 37 pair in row 3 at col 6 and 9. The rest of the puzzle goes rather smoothly.
Nice puzzle, with well telegraphed key element to the solution: very early on, the 3 and 7 pointing from the lower end of column 4 and, means that 1) the 3 and 7 must be in row 1 of block 1, and 2) there is a 37 pair in row 3 at col 6 and 9. The rest of the puzzle goes rather smoothly.