Here's the fifth puzzle, which is also medium difficulty like the fourth one, so may need a bit of figuring out. Don't forget you can use the "Undo" button to go back if you find you've gone wrong.
As before, use your mouse to left-click to select numbers you're sure of, and right-click for numbers you think are possibles. Use the "Float Window" button to popup a new window which you can make bigger or smaller as you want.
According to Sudoku Sensei, this puzzle 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.