Before the star menu, you get a full CGI scene not seen in the film.
The first cutscene, showing Mike and Sully on their way to monster training.
During monster training, you will be shown how to play the game by Roz.
During training, robotic children called "Nerves" will give you a chance to practice scaring children.
Complete the initial training and Mike and Sully will receive additional training from Henry Waternoose personally...
... For which there are for sections.
Collecting these cans of green ooze are needed to scare children.
Collecting the Monster Inc. coins are needed for you to earn a silver medal in each level.
Finding snacks will restore you health.