Yes, they’re all solvable without guessing. Here’s a previous discussion on level 30 which might help.
6 days ago(+1)
You can put an X on the third row, right next to the cell you’ve filled.
Regardless of whether your currently-filled cell in that row belongs to the 4 or the 1, it’s impossible for the cell to the right of it to be filled, so it must be an X.