Solving Sudoku puzzles made easy (part 5)

We're doing row two, missing numbers 1,2 and 6.
There's only one place the 2 can go, so do that, that leaves you only one place where the 1 can go, once you've done that, plop in the 6 in the top-left box.
So there's then only one place in the top-left box where the 5 can go.
Next, attack column four. There's only one place the 9 can go, and only one place the 7 can go (actually we could have done the 7 earlier, ah well).
Then look at column six. The only missing numbers are 2 and 6, so going back to column four, the 2 has to go in where it does.
We can have a stab at row one as well, so write down 6,7 and 9 in the margin.

Full series here.