STEP 3

CHECK OUT the 2 at the top. The number next to it is ‘greater than’ 2 — but it can’t be a 4 or a 5 (because they already appear in that column). So it must be a 3... leaving space for a 2 below it, with the 1 at the bottom. And since we have a 2 in the right-hand column, there must be a 2 bottom-left. The cell above that now has to be a 3, confirming the fourth cell along that row as a 2.