Check my profile for level 5-9. They are a whole lot tougher than this if you thought level 3 and 4 were tough.
Just to add, you can sword climb by jumping and slashing with the sword. Just like in the game GunZ, except that it is Jump>Slash>Jump>Dash>Slash>Jump>Dash>Slash. But don't do it. It's pointless and for noobs.