Kids 13 and up are going crazy over Guitar Hero III (and waiting on Rock Band). The younger ones will soon be wild for High School Musical: Sing It! This is pure, silly, video-game-style karaoke, starring your budding Zac Efron fan. (If you don’t have the add-on microphone, buy the bundle.) And since everyone knows how to sing, it might just be the one game you play with your kid.