When you play Guitar Hero Smash Hits, you'll either play in Career Mode, Quick Play, or Head to Head. In Career mode, you are an unknown band and trying to work your way into successful career. As you play in each venue, you move up in rank by earning stars based on your performance. So the better you do on each song, the faster you will be able to access new venues. While you do not need to complete each venue to move forward, if you decide to do so you will access a bonus “encore” song. These bonus songs on Guitar Hero Smash Hits songlist are not visible until you unlock them.
As you go along in Guitar Hero Smash Hits, you may want to skip certain songs. The Guitar Hero Smash Hits songlist gives you a bit of leeway and allows you to earn your performance stars from songs in any venue you have access to. After each song is completed, you get a status report on how well you did. The better you do the more money you earn and more bonus items you can unlock.
The actual songs on Guitar Hero Smash Hits seem to have been revamped a bit to try and make them a bit more difficult. However, if you consistently play “Expert” level from the beginning, you may not notice much change.