Let's Make Number Place (Elementary course)
Let's Make Number Place : Step 4
5. Fill in 1s.
Next, let's fix 1s.
We fixed the first 1 on the bottom center.
To make it valid, we need to put 1s in the exposed cells on the pink lines. In this case, two 1s are easily fixed to the marked exposed cells.
6. Leave 1s and put 4s.
Here just leave 1s for now and consider other figures. For example, place a 4 on the middle right. It will be valid by placing 4s on the marked exposed cells.
Here, let's check how many cells can be filled if the marked exposed cell becomes 4.
The marked cell will be fixed as 4.
We can't find any other cells for 4, for now.
7. Let's come back to 1s.
Coming back to 1s, the marked cell becomes 1.
