Some missions are more involved than others, but they last about 10 minutes on average. It'll take you roughly six hours to reach the end of the story. You can tack on another couple of hours if you intend to replay levels and collect all of the magic keys, which ultimately unlock actual gourmet cooking recipes that you can prepare in your own kitchen at home. That's a decent length for a movie-based game, and acquiring the know-how to make a bacon-rich quiche lorraine certainly is a neat bonus. Unfortunately, you may find yourself bored before you're halfway through the quest.
Remy is a lively, animated rodent, but his enemies are a bunch of stiff insects and reptiles.
The disc also includes a pair of competitive multiplayer games. One lets you race a friend to the finish line. The other lets you compete to see who can grab the most cheese before time runs out. Both games are fun diversions and include a healthy collection of stages. You probably won't bother much with them, though, since they're limited to two players and require both players to be in the same room and have their own copies of the game.
Like the majority of games based on movies, Ratatouille for the PSP is a derivative 3D adventure that borrows ideas from a number of other familiar 3D adventure games. However, it also serves up some intricately designed levels and lets you go wild with Remy's acrobatics in the movie's settings for a solid six to eight hours. Video game fanatics will likely burn out on this game quickly, but there's a good chance that fans of the movie will get their money's worth.