Switching screens on the mission select can sometimes temporarily glitch out, placing a string of 9999999s all over the place for skill points and scores.
Pretty sure this is just a programming oversight: When you complete objectives, like, destroying a town, instead of it saying you get 5000 Souls, it says you get $5000.
Some of the letters are way too picky about the clicking location, and sometimes buggy. I clicked the letter W 3 times on the spot and it claimed it was wrong.
Congratulations! You just won the Commander in Sleep Badge and 15 points!
For those saying it's impossible, it's not. They have a walkthrough for a reason. >_>