Up to now, our strategy has been to enter all the possibles for any number with a high frequency rate within the puzzle. Now, we've got enough numbers entered into the grid that we can use a different solving strategy.

Let's look at block 3. We have seven of the nine numbers required. We are missing only the 3 and the 9. Looking at the top row, we see that it already contains a 3 (in block 2). Therefore, the 3 must go in the bottom left square of block 3 and (Eureka!) the 9 in the last remaining square.

Wow! We've come along way towards solving this puzzle.

And on further examination we see that the only number missing in column 7 is the number 2. So we can enter it in block 9.