Here's the fifth puzzle, which is also medium difficulty like the fourth one, so may need a bit of figuring out.
As before, you can resize your browser window to make the puzzle bigger or smaller as you want. To fill in a number that you definitely know, use your mouse to left-click on the square and select the number. If you're not sure but want to mark a possibility (for example, the 2 can either be here or here), then right-click on the square instead and select the number. This possibility will be written smaller and grey in the corner of the square, like a pencil mark to remind you.
The code running here is from the ActivityWorkshop, and the numbers were generated using the free (GPL'd) software
This example is coded as
N2x01-058 which means a single level 2 rule is needed to solve it, and it starts with 58
empty squares. It's this level 2 rule which bumps the complexity up to medium.