The walkthrough is mostly not needed, because of the phone hints when you get lost. It IS helpful for the emails to Claire, if you are not a native english speaker (just remember you are trying to sound helpful and concerned). Also, it was interesting reading Claires diary with all the wrong choices about her co-worker (you don't get to read them if you pick the right choices to advance the story). The only real must-haves (IMHO) in the walk through are the directions to get a tie in the fashion contest, the knowledge that the casino is opened up by riding the train, how to get a hold of some concert tickets, and the location of the cosplay items.Do I have to play with a walkthrough to not miss content? I had a look at the walkthrough and it was so detailed that it gave me a headache.