I don't use guides anymore because that's one of the reasons why i have the internet. when I did it was for The Legend of Zelda Ocarina of Tima and Majora's Mask, and Final Fantasy X. In use them throught out the game. To find hidden treasures and with Zelda without my guide I would've never found out about the biggoron sword, or a lot of the sidequests in Majora's Mask.