Dont even bother with knock knock for Xp its not worth it, you will need to click about 10 times in between the talk menus and you only get like 10 xp per, you will spend MANY EXTRA HOURS just to level up there when you can easily level up just by playing the game normally, leveling is easy as hell, I got to level 20 on Normal when I was less then half way thru the game.....
You can however use Knock Knock to bang out the 50 speech challenges since she tells you the same joke over and over
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